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Chemical Process MCQ Questions & Answers

Chemical Process MCQs : This section focuses on the "Chemical Process". These Multiple Choice Questions (MCQs) should be practiced to improve the Chemical Process skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

Anion exchanger is regenerated usually with

A. NaOH
B. H₂SO₄
C. Hydrazine
D. Alum solution

View Answer

Question 2

Percentage of uranium in carnotite ore found in Jadugoda (Jharkhand) is about

A. 0.1 to 0.5
B. 1 to 5
C. 5 to 10
D. 15 to 25

View Answer

Question 3

Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.

A. Chromium
B. Arsenic
C. Copper
D. Mangnese

View Answer

Question 4

Ordinary glass is not a/an

A. Amorphous isotropic material
B. Supercooled liquid
C. Material with sharp definite melting point
D. Electrical insulator

View Answer

Question 5

Vegetable oils and fats basically differ in their

A. Density ranges
B. Physical state
C. Chemical composition
D. Chemical properties

View Answer

Question 6

The most reactive allotropic form of phosphorus is __________ phosphorus.

A. Red
B. Yellow
C. Violet
D. Black

View Answer

Question 7

Esterification reaction produces

A. detergent
B. vanaspati
C. soap
D. mercaptans

View Answer

Question 8

Function of sodium thiosulphate (hypo) in development of photographic film/plate is to

A. Brighten the faint images
B. Remove metallic silver
C. Convert silver chloride to silver
D. Remove unexposed silver halide

View Answer

Question 9

Sudden temperature fluctuation does not affect pyrex glass, because of its

A. Low co-efficient of expansion
B. High co-efficient of expansion
C. High melting point
D. Both B and C

View Answer

Question 10

Metallic soap is __________ salt of fatty acids.

A. Sodium
B. Potassium
C. Both sodium & potassium
D. Aluminium or calcium

View Answer

Question 11

Which of the following processes does not produce Cl₂ as a co-product during the manufacture of caustic soda?

A. Diaphragm electrolytic cell process
B. Mercury electrolytic cell process
C. Lime-soda process
D. None of these

View Answer

Question 12

Pick out the wrong statement.

A. Cold rubber (SBR) is superior as compared to hot rubber (SBR)
B. Polymerisation temperature can modify the properties of SBR
C. Production of cold SBR employs lower pressure as compared to that of hot SBR
D. None of these

View Answer

Question 13

Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils

A. Cause cholesterol build up and blood clotting
B. Are prone to rancid oxidation
C. Always contain some amount of nickel (as their complete removal is very difficult)
D. Have affinity to retain harmful sulphur compounds

View Answer

Question 14

Nicotine is

A. A volatile alkaloid
B. Obtained by treating by-products of the tobacco processing industry
C. Both A and B
D. Neither A nor B

View Answer

Question 15

Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement?

A. Xanthates
B. Stearic acid
C. Calcium & aluminium stearate
D. Formic acid

View Answer

Question 16

In the Solvay process, the product from the calciner is

A. Light soda ash
B. Dense soda ash
C. Sodium bicarbonate
D. Dehydrated soda ash

View Answer

Question 17

Molasses is the starting material for the production of

A. Alcohol
B. Essential oil
C. Fatty acids
D. Massecuite

View Answer

Question 18

Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H₂O = Fe₃O₄ + 4H₂, is not practised, as it is

A. A slow reaction
B. A discontinuous reaction (requiring regeneration of iron by water gas intermittently)
C. Still in development stage (by employing fluidised bed technique)
D. All of the above

View Answer

Question 19

Esterification reaction

A. produces soap.
B. is reversible.
C. is a reaction between an alcohol and an organic acid.
D. all (a), (b) and (c).

View Answer

Question 20

Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.

A. Nickel
B. Vanadium
C. Alumina
D. Iron

View Answer

Question 21

Chemical formula of BHC, which is an insecticide is

A. C₆H₆Cl₆
B. C₆Cl₆
C. C₆H₅Cl
D. C₆H₄Cl₂

View Answer

Question 22

Cellulose content of bamboo and ideal fibrous raw material for the manufacture of paper is __________ percent.

A. 10
B. 50
C. 80
D. 95

View Answer

Question 23

Carborundum consists mainly of

A. Bauxite
B. Silicon carbide
C. Boron carbide
D. Calcium carbide

View Answer

Question 24

The basic constituent of vegetable oils is

A. Triglyceride
B. Fatty acids
C. Fatty alcohol
D. Mono esters

View Answer

Question 25

Hard water

A. Does not affect the lather formation by soap
B. Is not unfit for drinking purpose
C. Pollutes the water stream
D. All of the above

View Answer

Question 26

Thermal pyrolysis of ethylene dichloride produces

A. Trichloroethylene
B. Vinyl chloride
C. Ethanol amine
D. Ethylene oxide

View Answer

Question 27

Thorium is mainly used

A. For the manufacture of gas mantles
B. As a fissile fuel in a nuclear reactor
C. In the manufacture of hydrogen bomb
D. In the treatment of cancer

View Answer

Question 28

Synthesis gas' meant for the synthesis of organic compound is a variable mixture of

A. N₂ & H₂
B. CO₂ & H₂
C. CO & H₂
D. C & H₂

View Answer

Question 29

At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants.

A. Independent of
B. Directly proportional to
C. Inversely proportional to
D. Proportional to the square of

View Answer

Question 30

Calgon used in water treatment is chemically

A. Sodium phosphate
B. Sodium hexametaphosphate
C. Calcium phosphate
D. Tricresyl phosphate

View Answer

Question 31

Epoxy resin

A. is a good adhesive.
B. is an elastomer.
C. cannot be used for surface coatings.
D. is a polyester.

View Answer

Question 32

Pick out the wrong statement.

A. DDT is manufactured by the condensation of chlorobenzene with chloral at 30°C in presence of oleum, which is a highly exothermic reaction
B. Chloral is obtained by the chlorination of ethyl alcohol
C. Insecticides acting on the insects through the respiratory system are called fumigants
D. Benzene hexachloride is not a contact insecticide

View Answer

Question 33

L.D. converter is used in the production of

A. Pig iron
B. Steel
C. Copper
D. Zinc

View Answer

Question 34

Raw materials for 'Solvay Process' for manufacture of the soda ash are

A. Salt, limestone and coke or gas
B. Ammonia, salt and limestone
C. Ammonia limestone and coke
D. None of these

View Answer

Question 35

Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

A. Poor oxidation stability and high gum forming tendency
B. Greater tendency of decomposition at elevated temperature
C. Hydrolysis tendency in presence of water
D. All of the above

View Answer

Question 36

Production of one ton of cement requires about __________ tons of limestone.

A. 0.6
B. 1.2
C. 2.2
D. 3.8

View Answer

Question 37

Fusion of bauxite and __________ produces high alumina cement.

A. alum
B. limestone
C. coke
D. quartz

View Answer

Question 38

Which is the main reducing agent during production of iron from iron ore in a blast furnace ?

A. C
B. CO
C. CO2
D. H2

View Answer

Question 39

Iron ore hametite is concentrated using

A. Electro magnetic separation mainly
B. Gravity separation
C. Froth floatation
D. Roasting

View Answer

Question 40

Gun powder, which is an explosive comprises of charcoal, sulphur and

A. Glycerene
B. Salt petre
C. Nitro glycerene
D. Dynamite

View Answer

Question 41

Fat splitting catalyst is

A. CaCO₃
B. ZnO
C. Al2O₃
D. Fe

View Answer

Question 42

Permanent hardness of water can be removed by

A. Addition of soda ash to it
B. Treating it with zeolites
C. Passing it through sodium hexametaphosphate
D. All of the above

View Answer

Question 43

A good quality coal should have

A. Low fusion point of ash
B. High ash content
C. High sulphur content
D. None of these

View Answer

Question 44

Reaction of ethylene glycol and dimethyl terephthalate (DMT) produces

A. Nylon-6
B. Dacron
C. Polyester
D. PVC

View Answer

Question 45

Poly tetraflouro ethylene (P.T.F.E.) is known as

A. Bakelite
B. Teflon
C. Celluloid
D. Decron

View Answer

Question 46

Bromine content in sea water may be around __________ ppm.

A. 70
B. 640
C. 1875
D. 2500

View Answer

Question 47

Fourdrinier machine is used in the manufacture of

A. Nylon-6
B. Paper
C. Antibiotics
D. Sugar

View Answer

Question 48

Mercury cells for caustic soda manufacture, compared to diaphragm cells

A. Require lower initial investment
B. Require more power
C. Produce lower concentration NaOH
D. None of these

View Answer

Question 49

Shrinkage volume in cement setting does not depend upon the

A. Sand to cement ratio
B. Water to cement ratio
C. Ambient temperature fluctuation
D. Drying period

View Answer

Question 50

Phthalic anhydride is made by the

A. Oxidation of naphthalene
B. Oxidation of benzene
C. Dehydrogenation of ethyl benzene
D. None of these

View Answer

Question 51

Producer gas consists mainly of

A. CO, CO2 N2, H2
B. CO, H2
C. H2, CH4
D. C2H2, CO2, H2

View Answer

Question 52

Permanent hardness of water is due to the presence of calcium & magnesium

A. Bi-carbonates
B. Sulphates & chlorides
C. Carbonate
D. None of these

View Answer

Question 53

Bromine is used in the preparation of

A. Fire extinguishing compounds
B. Fire proofing agents
C. Dyes and antiknock compounds
D. All of the above

View Answer

Question 54

CaCl(OCl) is the chemical formula of

A. Hypo
B. Bleaching powder
C. Plaster of paris
D. Aqua regia

View Answer

Question 55

__________ iron is the purest form of iron.

A. Cast
B. Wrought
C. Pig
D. High silicon

View Answer

Question 56

Which of the following may be viewed as a catalyst in the manufacture of soda ash by Solvay process?

A. NH?
B. NaCl
C. CaO
D. Coke

View Answer

Question 57

Teflon is

A. Phenol formaldehyde
B. An inorganic polymer
C. Poly tetrafluoroethylene (P.T.F.E.)
D. A monomer

View Answer

Question 58

Phthalic anhydride is produced by the oxidation of

A. Naphthalene
B. Benzene
C. Toluene
D. Aniline

View Answer

Question 59

Pick out the wrong statement.

A. Wine, rum & Vodka are prepared by the formulation of fruit juice, sugar beet & rye respectively
B. Protein catalysts are called enzymes
C. The rate of chemical reaction is independent of the concentration of reactants at high concentration of enzymes
D. Total sugar content in molasses is about 10%

View Answer

Question 60

Production of alcohol by fermentation of molasses is an __________ process.

A. Anaerobic
B. Aerobic
C. Endothermic
D. Both B and C

View Answer

Question 61

Use of chlorine in the treatment of sewage

A. Helps in grease separation
B. Increases the biological oxygen demand(BOD)
C. Causes bulking of activated sludge
D. Aids in flocculation

View Answer

Question 62

Process conditions in fermentator used for production of penicillin is

A. 25°C, 2 atm
B. 50°C, l0 atm
C. 30°C, 200 mm Hg (absolute)
D. 90°C, 45 atm

View Answer

Question 63

Low temperature carbonisation of coal takes place at __________ °C.

A. 300
B. 1100
C. 700
D. 900

View Answer

Question 64

Pick out the wrong statement.

A. Dry process is used for the manufacture of cement, when the raw material is blast furnace slag
B. Portland cement is made employing wet process
C. Gypsum is added to portland cement to lengthen its setting time
D. None of these

View Answer

Question 65

In the manufacture of sulphuric acid from elemental sulphur, the following sequence of major operations is followed :

A. Furnace → converter → absorber
B. Furnace → evaporator → absorber
C. Furnace → converter → evaporator
D. Converter → furnace → absorber

View Answer

Question 66

Which of the following is a detergent?

A. Benzene hexachloride
B. Alkyl benzene sulphonate
C. Polytetraflouroethylene
D. Cellulose nitrate

View Answer

Question 67

Thermoplastic materials

A. Do not soften on application of heat
B. Are heavily branched molecules
C. Are solvent insoluble
D. None of these

View Answer

Question 68

The terminology 'BTX' used in coal tar distillation industry refers to

A. Benzol-toluol-xylol
B. Benzol-toluene-xylene
C. Benzene-toluol-xylol
D. Benzene-toluene-xylene

View Answer

Question 69

Margarine is a/an

A. Fat
B. Explosive
C. Plasticiser
D. Rocket propellant

View Answer

Question 70

Riboflavin is a/an

A. Vitamin
B. Analgesic drug
C. Anaesthetics
D. Anti-malarial drug

View Answer

Question 71

Ore concentration by froth floatation utilises the __________ of ore particles.

A. Density difference
B. Wetting characteristics
C. Terminal velocities
D. None of these

View Answer

Question 72

In the Lurgi coal gasifier

A. coking coals cannot be used.
B. low carbon conversion efficiency is achieved.
C. entrainment of solids is higher.
D. large quantity of coal can be processed.

View Answer

Question 73

Pick out the true statement pertaining to water treatment.

A. Slow sand filters can remove colour completely
B. Activated carbon can be used for taste & odour control without subsequent filtration
C. Application of activated carbon reduces the temporary hardness of water
D. Normally, the turbidity is removed by adding a coagulent prior to sedimentation

View Answer

Question 74

Coke used for the production of calcium carbide should have

A. Low ash content
B. Low ignition temperature
C. High electrical resistivity
D. All of the above

View Answer

Question 75

Which of the following is an explosive?

A. Nitroglycerene
B. Trintrotoluene (TNT)
C. Cellulose nitrate
D. All of the above

View Answer

Question 76

The type of high refractive index glass used in optical instruments is __________ glass.

A. Pyrex
B. Flint
C. Crookes
D. None of these

View Answer

Question 77

The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is

A. Dilute H₂SO₄
B. Oleum
C. Ultraviolet light
D. None of these

View Answer

Question 78

Which of the following is used as a coagulant in water treatment?

A. Chloramine
B. Chlorine
C. Ferrous sulphate
D. Hydrogen peroxide

View Answer

Question 79

Extraction of __________ employs an electrolytic process.

A. Aluminium
B. Silver
C. Copper
D. All of the above

View Answer

Question 80

Glycerine is a by-product of the __________ industry.

A. Soap
B. Detergent
C. Oil hydrogenation
D. Paint

View Answer

Question 81

The main use of HCl is in the

A. drilling of petroleum wells and pickling of steel sheets.
B. manufacture of cationic detergent.
C. treatment of spent fuel of nuclear reactor.
D. none of these.

View Answer

Question 82

Magnesium and calcium __________ cause temporary hardness of water.

A. Carbonates
B. Bicarbonates
C. Phosphates
D. Sulphates

View Answer

Question 83

Main use of hydrazine is

A. As a rocket fuel
B. In water treatment
C. As a disinfectant
D. As fire retardant

View Answer

Question 84

Digestion of wood-base materials (for manufacture of pulp) is done to

A. Remove lignin
B. Produce long fibres
C. Prevent deterioration on storage
D. None of these

View Answer

Question 85

Phosphate rock is a raw material for the manufacture of

A. Phosphoric acid
B. Phosphorous
C. Superphosphates
D. All of the above

View Answer

Question 86

The temperature in the calcium carbide furnace is __________ °C.

A. 200-300
B. 700-850
C. 2000-2200
D. 4000-4500

View Answer

Question 87

Which of the following is an ore of iron?

A. Galena
B. Chalcopyrite
C. Hematite
D. Bauxite

View Answer

Question 88

__________ is used as a flux in the smelting of copper ore like chalcopyrite.

A. Coke breeze
B. Lime powder
C. Silica/quartz
D. Dolomite

View Answer

Question 89

__________ paper is used in the manufacture of newsprint paper.

A. Groundwood
B. Board
C. Tissue
D. Wrapping

View Answer

Question 90

In sulphate pulp manufacture, the pressure and temperature in the digestor is

A. 10 atm., 800 °C
B. 10 atm., 170-180°C
C. 1 atm., 170 - 180°C
D. L atm., 800°C

View Answer

Question 91

P.T.F.E. (Poly tetra fluoro ethylene) is commercially known as

A. Bakelite
B. Neoprene
C. Teflon
D. Nylon-66

View Answer

Question 92

Enzymes are

A. Proteins with high molecular weight (around 10, 000)
B. Derived from living organisms
C. Catalyst for temperature sensitive reactions
D. All of the above

View Answer

Question 93

Bisphenol A is produced by the condensation of acetone with

A. Formaldehyde
B. Ethyl alcohol
C. Diethyl ether
D. Phenol

View Answer

Question 94

Portland cement consists mainly of

A. CaO & SiO₂
B. SiO₂ & Al2O₃
C. CaO & Al2O₃
D. CaO & FE₂O₃

View Answer

Question 95

Pick out the endothermic reaction out of the following.

A. C+O2 = CO
B. CO + 3H2 = CH4 + H2O
C. CaCO3 = CaO + CO2
D. CO +O2 = CO2

View Answer

Question 96

Coal tar is used as a

A. Binding material for coal briquettes
B. Fuel in rotary kiln
C. Binder in making carbon electrodes
D. All of the above

View Answer

Question 97

Cumene (isopropyl benzene) is made by

A. Oxidation of napthalene
B. Propylene alkylation of benzene
C. Polymerisation of a mixture of benzene & propylene
D. None of these

View Answer

Question 98

Which oil is preferred for paint manufacture?

A. Drying oil
B. Non-drying oil
C. Semi-drying oil
D. Saturated oil

View Answer

Question 99

Oxidation of SO2 to SO3 is favoured by

A. low temperature and low pressure.
B. low temperature and high pressure.
C. high temperature and low pressure.
D. high temperature and high pressure.

View Answer

Question 100

Percentage of alcohol in beer may be around __________ percent.

A. 2-8
B. 18-23
C. 27-32
D. 1-4

View Answer

Question 101

In premitive days, __________ was being manufactured by Leblanc Process.

A. Alum
B. Washing soda
C. Soda ash
D. Calcium carbide

View Answer

Question 102

In multistage equilibrium conversion of SO₂ to SO₃ (2SO₂ + O₂ ⇋ 2SO₃), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO₂ to SO₃ can be increased by

A. Increasing the oxygen concentration
B. Putting more quantity of V₂O₅ catalyst in the converter
C. Removing some quantity of SO₃ during intermediate stage
D. Maintaining low temperature & pressure in the converter

View Answer

Question 103

Litharge is

A. Lead oxide
B. Zinc oxide
C. Zinc sulphide
D. Cellulosic photographic material

View Answer

Question 104

Sea weeds are an important source of

A. Fluorine
B. Chlorine
C. Bromine
D. Iodine

View Answer

Question 105

__________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant.

A. Pyrex
B. Soda lime
C. Lead
D. High silica

View Answer

Question 106

What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell?

A. Cl₂ & Na
B. Cl₂ & H₂
C. O₂ & H₂
D. Cl₂, H₂ & NaOH solution

View Answer

Question 107

Fermentator temperature during production of alcohol from molasses is around __________ °C.

A. 5
B. 30
C. 150
D. 300

View Answer

Question 108

The catalyst used in the manufacture of DDT is

A. Alumina
B. Silica
C. 20% oleum
D. Aluminium chloride

View Answer

Question 109

Absorption of SO₃ in 97% H₂SO₄ is

A. Exothermic
B. Endothermic
C. Not possible
D. None of these

View Answer

Question 110

Insulin is an __________ drug.

A. Anti-malarial
B. Anti-TB
C. Antibiotic
D. None of these

View Answer

Question 111

Rotary kiln is not involved in the production of

A. Cement
B. Lime from limestone
C. Slaked lime from quick lime
D. None of these

View Answer

Question 112

Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material?

A. Slag cement
B. Glasses
C. Porcelain/Potteries
D. Teflon

View Answer

Question 113

Ca(OH)₂ is called

A. Quicklime
B. Slaked lime
C. Limestone
D. Gypsum

View Answer

Question 114

Liquefaction of gases can not be done by

A. Exchange of heat with colder stream
B. Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
C. Merely compressing it beyond critical pressure
D. Adiabatic expansion against a piston or in a turbine

View Answer

Question 115

Glycerine can be obtained from

A. Fat
B. Naphthalene
C. Cumene
D. Sucrose

View Answer

Question 116

Flux addition during smelting of ore is done to

A. Remove impurities/gangue
B. Enhance rate of reaction
C. Accelerate reduction of ore
D. Separate slag from metal

View Answer

Question 117

Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of

A. calcium sulphate
B. sodium chloride
C. sodium sulphate
D. magnesium chloride.

View Answer

Question 118

Nickel is not used as a catalyst in the

A. Fischer-Tropsch process
B. Shift conversion
C. Hydrogenation of oil
D. Ostwald's process of HNO₃ manufacture

View Answer

Question 119

Baking soda is chemically represented by

A. Na₂CO₃
B. NaHCO₃
C. Na₂CO₃.H₂O
D. Na₂CO₃.10H₂O

View Answer

Question 120

Which of the following is an unsaturated fatty acid?

A. Lauric acid
B. Palmitic acid
C. Stearic acid
D. Oleic acid

View Answer

Question 121

Vegetable oils contain large quantity of glycerides of unsaturated acids. When the vegetable oils contain high amount of saturated fatty acids, it is termed as __________ oil.

A. Drying
B. Semi-drying
C. Non-drying
D. None of these

View Answer

Question 122

Poly Vinyl Chloride (P.V.C.) is a __________ material.

A. Thermosetting
B. Thermoplastic
C. Fibrous
D. Chemically active

View Answer

Question 123

Platinum catalyst used in the earlier days of sulphuric acid manufacture by contact process suffers from the drawback like

A. High cost
B. Fragile nature
C. Easy poisoning tendency
D. All of the above

View Answer

Question 124

Helium is produced on commercial scale from

A. Air
B. Natural gas
C. Coke oven gas
D. None of these

View Answer

Question 125

Removal of dirt/soil by soaps or detergent does not involve the __________ of soil.

A. Emulsification
B. Dispersion
C. Precipitation
D. Wetting

View Answer

Question 126

Hydrazine (N₂H₄) is used mainly as a/an

A. Explosive
B. Rocket fuel
C. Detergents additive
D. None of these

View Answer

Question 127

Saponification number of an oil or fat

A. Gives an idea about its molecular weight
B. Is inversely proportional to its molecular weight
C. Detects its adulteration
D. All of the above

View Answer

Question 128

Which of the following is a constituent of coffee?

A. Caffeine
B. Nicotine
C. Calgon
D. Lignin

View Answer

Question 129

Cooking liquor in case of sulphite process is

A. Sodium sulphite and sodium bisulphite
B. Magnesium sulphite and free SO₂ in acid medium
C. Magnesium sulphate and magnessium bicarbonate
D. None of these

View Answer

Question 130

Mannheim furnace is used in the manufacture of

A. Hydrochloric acid
B. H₂SO₄ by Chamber process
C. Calcium carbide
D. Corundum

View Answer

Question 131

__________ of quicklime produces slaked lime.

A. Hydration
B. Dehydration
C. Hydrogenation
D. None of these

View Answer

Question 132

Bakelite is chemically known as

A. Polyvinyl chloride (PVC)
B. Polybutadiene
C. Phenol formaldehyde
D. Polyurathane

View Answer

Question 133

In industrial nomenclature, alcohol means

A. Butyl alcohol
B. Propyl alcohol
C. Ethanol
D. Methyl alcohol

View Answer

Question 134

The drug used in contraceptives is

A. sulphadizene
B. mestranol
C. methyl salicylate
D. pencillin

View Answer

Question 135

Bleaching of paper pulp is done with

A. Activated clay
B. Bromine
C. Chlorine or chlorine dioxide
D. Magnesium sulphite

View Answer

Question 136

Gun powder, which is an explosive comprises of charcoal, sulphur and

A. glycerene
B. salt petre
C. nitro glycerene
D. dynamite

View Answer

Question 137

Massecuite is

A. Used for paper making
B. Used as a cattle feed
C. Highly acidic in nature
D. None of these

View Answer

Question 138

Reverse osmosis is normally used for the

A. Separation of isotopes of uranium from gaseous uranium hexaflouride
B. Separation of helium from natural gas
C. Desalination of brackish water to produce potable (drinking) water
D. Purification of oxygen

View Answer

Question 139

Which of the following paper does not require a filler during manufacture?

A. Bond paper
B. Writing paper
C. Blotting paper
D. Coloured paper

View Answer

Question 140

Reaction of an alcohol with organic acid is called the __________ reaction.

A. Saponification
B. Esterification
C. Neutralisation
D. Acidification

View Answer

Question 141

Which of the following is not required in the manufacture of soda ash by Solvay process?

A. Ammonia
B. Limestone
C. Nitric acid
D. None of these

View Answer

Question 142

Alum [Al2(SO₄)₃] is used as a coagulant in water treatment to remove

A. Colour
B. Turbidity
C. Bacteria
D. All of the above

View Answer

Question 143

__________ of rubber decreases after its vulcanisation.

A. Resistance to the action of organic solvent
B. Tackiness
C. Maximum service temperature
D. Tensile strength

View Answer

Question 144

Which of the following processes can remove both temporary as well as permanent hardness of water?

A. Filtration
B. Boiling
C. Distillation
D. None of these

View Answer

Question 145

Main use of liquid nitrogen is in

A. Rocket propulsion
B. Making gun powder
C. Detergent manufacture
D. Refrigerative cooling

View Answer

Question 146

Zeolite is used in the

A. Water treatment
B. Glass manufacture
C. Hydrogenation of fatty oil as a catalyst
D. Development of exposed photographic plate

View Answer

Question 147

Major component of flint glass is

A. Lead oxide
B. Silica
C. Alumina
D. Soda

View Answer

Question 148

__________ process is used for the manufacture of sodium carbonate by ammonia soda process.

A. Ostwald's
B. Bosch
C. Solvay
D. Haber's

View Answer

Question 149

Kopper-Totzek coal gasifier

A. Can give ammonia synthesis gas (H₂ + N₂)
B. Is a moving bed reactor
C. Cannot use coking coal
D. Operate at very high pressure

View Answer

Question 150

Lime and soda ash are added to water to remove

A. Bicarbonates & sulphates of calcium and magnesium
B. Undersirable taste and odour
C. Bacteria
D. Its corrosiveness

View Answer

Question 151

Oxygen is produced by fractionation of air using __________ process.

A. Linde's
B. Claude's
C. Either A or B
D. None of these

View Answer

Question 152

Main constituent of limestone is

A. CaCO₃
B. MgCO₃
C. Na₂CO₃
D. CaSO₄

View Answer

Question 153

The major use of butadiene is

A. As a plasticiser for unsaturated polyester
B. In the manufacture of synthetic rubber
C. As an anti-skinning agent in paint
D. None of these

View Answer

Question 154

Favourable conditions for the liquefaction of gases in general are

A. High pressure & low temperature
B. Low pressure & high temperature
C. High pressure & high temperature
D. Low pressure & low temperature

View Answer

Question 155

Hollander beater used during paper pulp manufacture does not facilitate the __________ of fibre.

A. Cutting
B. Fibrillation
C. Hydration
D. Strengthening

View Answer

Question 156

10% oleum comprises of 10% free

A. SO₂
B. H₂SO₃
C. SO₃
D. H₂SO₄

View Answer

Question 157

Viscose rayon is chemically

A. cellulose nitrate
B. regenerated cellulose nitrate
C. cellulose acetate
D. regenerated cellulose acetate

View Answer

Question 158

Solvent used for extraction of oil is

A. Hexane
B. Methyl ethyl ketone
C. Furfurol
D. None of these

View Answer

Question 159

The amount of benzene present in pure benzol is about __________ percent.

A. 30
B. 50
C. 70
D. 90

View Answer

Question 160

The purpose of tanning in leather industry is to

A. Stiffen the leather
B. Smoothen the leather
C. Make it flexible
D. Impart water resistance

View Answer

Question 161

Alum is commercially produced from

A. Gypsum
B. Feldspar
C. Galena
D. Bauxite

View Answer

Question 162

Sulphuric acid saturated with SO₃ is called

A. Concentrated H₂SO₄
B. Sulphurous acid
C. Oleum
D. None of these

View Answer

Question 163

__________ is not a constituent of gun powder.

A. Carbon
B. Charcoal
C. Sulphur
D. Potassium nitrate

View Answer

Question 164

Which of the following is the main constituent of the mother liquor produced in salt industry?

A. Quick lime
B. Glauber's salt
C. Salt petre
D. Bromine

View Answer

Question 165

Nylon 66 is so named because the

A. Average degree of polymerisation of the polymer is 1966
B. Number of carbon atoms between two nitrogen atoms are 6
C. Number of nitrogen atoms between two carbon atoms are 6
D. Polymer was first synthesised in 1966

View Answer

Question 166

Yellow glycerine is made into white, using

A. Activated carbon
B. Diatomaceous earth
C. Bauxite
D. Bentonite

View Answer

Question 167

Chemical name of soda ash is

A. Sodium bicarbonate
B. Sodium thiosulphate
C. Potassium carbonate
D. None of these

View Answer

Question 168

Pick out the wrong statement.

A. Strongly caking coal should not be used in the Lurgi gasifier
B. Acetylene gas can not be used for illumination purpose
C. Water gas is called blue gas because of the color of the flame, when it is burnt
D. Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels

View Answer

Question 169

Raw material used in alcohol distilleries in India is

A. Molasses
B. Benzol
C. Methylated spirit
D. None of these

View Answer

Question 170

Electric bulbs are made of __________ glass.

A. Jena
B. Flint
C. Crookes
D. Pyrex

View Answer

Question 171

In contact process, SO₃ is absorbed in 97% H₂SO₄ and not in water, because

A. SO₃ gas is sparingly soluble in water
B. Water forms an acid mist, which is difficult to absorb
C. The purity of acid is affected
D. Scale formation in the absorber is to be avoided

View Answer

Question 172

The catalyst used in the production of elemental sulphur from H₂S (by oxidation-reduction) is

A. Alumina
B. Silica gel
C. Platinum
D. Nickel

View Answer

Question 173

How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?

A. 500°C
B. 750°C
C. 1000°C
D. 1500°C

View Answer

Question 174

Sulphur removal by heating of pyrite ore in presence of air is called its

A. Reduction
B. Roasting
C. Calcination
D. Smelting

View Answer

Question 175

Platinum is a versatile catalyst for many processes in chemical industries. It is highly prone to be poisoned by the presence of

A. Carbon
B. Arsenic
C. Lead
D. Sulphur

View Answer

Question 176

High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to

A. Flocculate the impurities
B. Facilitate fast filtration
C. Both A and B
D. Neither A nor B

View Answer

Question 177

Ethylene oxide is produced by oxidation of ethylene in presence of AgO catalyst at

A. 1 atm & 100°C
B. 5 atm & 275°C
C. 100 atm & 500°C
D. 50 atm & 1000°C

View Answer

Question 178

Catalytic oxidation of naphthalene produces

A. Styrene
B. Phenol
C. Phthalic anhydride
D. None of these

View Answer

Question 179

Which of the following is a detergent?

A. Fatty alcohol
B. Alkyl benzene sulphonate (ABS)
C. Fatty acids
D. Methylene chloride

View Answer

Question 180

Sodium salt of higher molecular weight fatty acid is termed as the __________ soap.

A. Hard
B. Soft
C. Metallic
D. Lubricating

View Answer

Question 181

Pick out the wrong statement pertaining to nitric acid.

A. About 90% of nitric acid is manufactured by Ostwald
B. It is a strong mono basic acid which reacts with almost all the metals except noble metals
C. Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO₂)
D. Arc process of nitric acid manufacture is economical as compared to Ostwald

View Answer

Question 182

A substance produced by a living organism and capable of anti-microbial activity is called a/an

A. Antibiotic
B. Antiseptic
C. Disinfectant
D. None of these

View Answer

Question 183

Caprolactum (a raw material for nylon-6 manufacture) is produced from

A. Phenol
B. Naphthalene
C. Benzene
D. Pyridine

View Answer

Question 184

Argon is the third largest constituent of air (followed by N₂ & O₂). Its percentage by volume in air is

A. 0.14
B. 0.34
C. 0.94
D. 1.4

View Answer

Question 185

Separation of fresh water from sea water can be done by the __________ operation.

A. Osmosis
B. Reverse osmosis
C. Absorption
D. Adsorption

View Answer

Question 186

Solvent extracted oil

A. Has low free fatty acid content
B. Is odourless
C. Has more of unsaturates
D. None of these

View Answer

Question 187

The most commonly used substance to speed up the sedimentation of sewage is

A. Lime
B. Sulphuric acid
C. Chlorine
D. Sodium bisulphite

View Answer

Question 188

Fermentation of molasses to produce ethyl alcohol is done at __________ °C

A. 20 - 30
B. < - 5
C. 100 - 150
D. 250 - 300

View Answer

Question 189

Massacuits is a terminology used in the __________ industry.

A. Paint
B. Oil hydrogenation
C. Soap
D. Sugar

View Answer

Question 190

The process used for the manufacture of ethyl alcohol from molasses is

A. Distillation
B. Dehydration
C. Dehydrogenation
D. None of these

View Answer

Question 191

Naphthalene is removed from coke oven gas by

A. Adsorbing on palladium
B. Absorbing in ethanolamine
C. Scrubbing with wash oil
D. Passing it through electrostatic precipitator

View Answer

Question 192

The only commercial Fischer-Tropsch plant for producing liquid hydrocarbon fuel from coal is located at

A. SASOL (in South Africa)
B. Redcar (U.K.)
C. Los-Angles (U.S.A.)
D. Trombay (India)

View Answer

Question 193

Pick out the wrong statement pertaining to solvent extraction of oil.Rate of extraction

A. Decreases with decrease of thickness of the flakes
B. Increases with the increasing flake size keeping the flake thickness constant
C. Increases Considerably with the rise of temperature
D. Decreases as the moisture content of flakes increases

View Answer

Question 194

Rancidity of the fatty oil can be reduced by its

A. Decoloration
B. Hydrogenation
C. Oxidation
D. Purification

View Answer

Question 195

Deacon's method is used for the manufacture of

A. Glauber's salt
B. Common salt
C. Chlorine
D. Graphite electrode

View Answer

Question 196

High purity nitrogen is used in

A. Making protective gas (95% N₂ + 5% H₂) for annealing of cold rolled steel strip coils
B. Fire fighting purposes
C. Both A & B
D. Neither A nor B

View Answer

Question 197

__________ acid is the main constituent of cotton seed oil.

A. Acetic
B. Linoleic
C. Palmitic
D. Oleic

View Answer

Question 198

Claude process of gas liquefaction employs

A. merely compression of gas beyond its critical pressure.
B. Joule-Thomson expansion cooling.
C. heat exchange with colder stream.
D. adiabatic expansion against a piston or in a turbine.

View Answer

Question 199

Dehydrogenation of ethyl benzene produces

A. Styrene
B. Naphthalene
C. Phenol
D. Benzoic acid

View Answer

Question 200

Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on

A. Slaked lime
B. Soda lime
C. Calcium perchlorate
D. None of these

View Answer

Question 201

The most widely used coagulant for removing suspended impurities from water is

A. Bleaching powder
B. Chlorine
C. Calcium sulphate
D. Alum

View Answer

Question 202

Which of the following is a bleaching agent added in the detergents to facilitate removal of stains caused due to blood, tea etc?

A. Sodium silicate
B. Sodium borate
C. Sodium tripolyphosphate (STPP)
D. Caustic soda

View Answer

Question 203

Salt cake is chemically represented by

A. Na₂SO₄
B. CaSO₄.1/2 H₂O
C. MgSO₄
D. BaSO₄

View Answer

Question 204

Refractory bricks having high thermal conductivity is desirable, when it is to be used in the

A. L.D. converter
B. Blast furnace
C. Rotary kiln
D. Recuperator

View Answer

Question 205

Production of one ton of dry paper pulp requires about __________ tons of bamboo or wood.

A. 1
B. 2.5
C. 5
D. 10

View Answer

Question 206

Fire clay is __________ refractory material.

A. A basic
B. An acidic
C. A neutral
D. Not a

View Answer

Question 207

Salt is added in the kettle during soap manufacture to separate

A. Soap from lye
B. Glycerine from lye
C. The metallic soap
D. The unsaponified fat from soap

View Answer

Question 208

Sodium chloride content in sea water is about __________ gms/litre.

A. 2
B. 10
C. 25
D. 50

View Answer

Question 209

Which of the following is a constituent of vinegar?

A. Around 10% alcohol
B. Around 1% acetic acid
C. Both A and B
D. Neither A nor B

View Answer

Question 210

Which of the following fuel gases contains maximum amount of carbon monoxide?

A. Coke oven gas
B. Water gas
C. Blast furnace gas
D. L.D. converter gas

View Answer

Question 211

Plasticisers are added to synthetic plastics to

A. Impart flexibility
B. Improve workability during fabrication
C. Develop new improved properties not present in the original resins
D. All of the above

View Answer

Question 212

Pencillin, an antibiotic drug was discovered by

A. Alexender
B. Flaming
C. Dr. Zivago
D. None of these

View Answer

Question 213

Hydrodenation of vegetable oils is a/an __________ reaction.

A. Endothermic
B. Autocatalytic
C. Exothermic
D. Homogenous

View Answer

Question 214

The process involved in converting rubber into a thin sheet or coating it on fabric is called

A. Extrusion
B. Mastication
C. Calendering
D. Valcanisation

View Answer

Question 215

Hydrazine is largely used

A. As a starting material for 'hypo'
B. In photographic industry
C. As rocket fuel
D. In printing industry

View Answer

Question 216

Which of the following is not a product of coal tar distillation?

A. Anthracene
B. Cresote oil
C. Carbolic oil
D. None of these

View Answer

Question 217

Presence of carbonaceous matter in the sewage

A. Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
B. Reduces sulphate ions to sulphides causing obnoxious smell
C. Increases the quantity of chlorine used for its purification
D. All of the above

View Answer

Question 218

Hydrogenation of oil/fat does not

A. Improve its resistance to rancid oxidation
B. Raise its melting point
C. Remove double bonds
D. None of these

View Answer

Question 219

Which form of sulphur is the most stable at room temperature?

A. Plastic
B. Monoclinic
C. Rhombic
D. Flowers of sulphur

View Answer

Question 220

A mineral is termed as 'ore', if

A. A metal can be economically extracted from it
B. It contains ≥ 40% metal
C. The metal present in it is costly
D. All of the above

View Answer

Question 221

Soap cannot be used with hard water, because

A. Hard water contains sulphate
B. They form insoluble calcium soaps which precipitate
C. They attract back the removed dirt
D. None of these

View Answer

Question 222

Paper grade bamboo contains about __________ percent cellulose.

A. 5
B. 20
C. 40
D. 60

View Answer

Question 223

The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is

A. dilute H2SO4
B. oleum
C. ultraviolet light
D. none of these

View Answer

Question 224

Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C.

A. 25
B. 60-70
C. 150-200
D. 250-300

View Answer

Question 225

Pick out the false statement pertaining to water treatment.

A. Aeration of water is effective in CO₂ removal
B. The zeolite water softening process reduces the hardness of water by not more than 50%
C. Sodium sulphate or sodium carbonate do not cause hardness in water
D. Water with pH value less than 7, is acidic

View Answer

Question 226

Hydrogenation of oil takes place in a/an __________ reactor.

A. Autothermal
B. Trickle bed
C. Plug flow
D. None of these

View Answer

Question 227

Ethanol amine is produced using ammonia and

A. Ethyl benzene
B. Ethylene oxide
C. Ethanol
D. Ethane

View Answer

Question 228

Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine?

A. Na₂CO₃
B. NaHCO₃
C. H₂
D. None of these

View Answer

Question 229

Ethyl alcohol cannot be produced

A. From waste sulphite substrate of paper mills
B. By esterification and hydroloysis of ethylene
C. From molasses
D. None of these

View Answer

Question 230

DDT stands for

A. Diethyl-diphenyl-trichloromethane
B. Dichloro-diphenyl-trichloromethane
C. Diphenyl-dichloro-trichloromethane
D. Dichloro-diphenyl-trichloroethane

View Answer

Question 231

Producer gas consists mainly of

A. CO, CO₂ N₂, H₂
B. CO, H₂
C. H₂, CH₄
D. C₂H₂, CO₂, H₂

View Answer

Question 232

During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to

A. Increase the rate of absorption
B. Avoid corrosion
C. Reduce the cooling water circulation rate
D. None of these

View Answer

Question 233

The noble gas which occurs most abundantly in the atmosphere is

A. Helium
B. Neon
C. Krypton
D. Argon

View Answer

Question 234

Fatty material used in soap making is

A. Fatty acid
B. Fatty alcohols
C. Tallow
D. Detergents

View Answer

Question 235

Raw materials used for producing __________ cement does not contain iron oxide.

A. waterproof
B. slag
C. white
D. pozzolan

View Answer

Question 236

High temperature carbonisation of coal takes place at __________ °C.

A. 2000
B. 700
C. 1100
D. < 500

View Answer

Question 237

Dense soda ash used in the manufacture of glass, is chemically represented by

A. Na₂CO₃
B. Na₂CO₃.10H₂O
C. Na₂CO₃.H₂O
D. Na₂HCO₃

View Answer

Question 238

Penicillin is separated from fermented broth by

A. Extraction with amyl or butyl acetate
B. Ternery azeotropic distillation
C. Evaporation in calendria
D. Extractive distillation

View Answer

Question 239

SO₂ is bubbled through hot sugar cane juice to

A. Act as an acidifying agent
B. Increase its concentration
C. Increase the amount of molasses
D. Increase the crystal size

View Answer

Question 240

Hard water

A. does not affect the lather formation by soap.
B. is not unfit for drinking purpose.
C. pollutes the water stream.
D. all (a), (b) and (c).

View Answer

Question 241

Which is the main reducing agent during production of iron from iron ore in a blast furnace?

A. C
B. CO
C. CO₂
D. H₂

View Answer

Question 242

Proximate analysis of coal determines its __________ content.

A. Moisture, ash, sulphur & volatile matter
B. Moisture & volatile matter
C. Moisture, sulphur, nitrogen & fixed carbon
D. None of these

View Answer

Question 243

Carboxymethyl cellulose (CMC) is added in detergents to act as a/an

A. Surfactant
B. Builder
C. Optical brightening agent
D. Anti soil redeposition agent

View Answer

Question 244

Drinking (potable) water treatment does not involve

A. Coagulation
B. Sedimentation
C. Softening
D. Disinfection

View Answer

Question 245

Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in

A. Pyrolysis of oil
B. Sintering of porous catalyst
C. Hydrogen embrittlement
D. All of the above

View Answer

Question 246

Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ °C.

A. -5 to 0
B. 5 to 10
C. 30 to 50
D. 75 to 80

View Answer

Question 247

Starting material for the commercial production of ethyl alcohol in India is

A. Rice
B. Molasses
C. Fruit of Mahua tree
D. Maize

View Answer

Question 248

Sodium bisulphite is used for __________ water.

A. Deaeration
B. Dechlorination
C. Both A & B
D. Neither A nor B

View Answer

Question 249

Alcohol percentage in molasses may be around

A. 10
B. 40
C. 70
D. 85

View Answer

Question 250

90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at __________ °C.

A. <0
B. 10-30
C. 250-280
D. 500-600

View Answer

Question 251

Glycerine is not used in the

A. Manufacture of explosive
B. Conditioning and humidification of tobacco
C. Manufacture of pharmaceuticals
D. None of these

View Answer

Question 252

Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?

A. High cost of mercury
B. High specific gravity of mercury
C. Non-availability of high purity mercury
D. Pollution of water stream by mercury

View Answer

Question 253

In the manufacture of viscose rayon, the raw material used industrially is

A. Recalyptious wood
B. Bamboo
C. Bagasse
D. Fine teak wood

View Answer

Question 254

Carbon disulphide is mainly used in the production of

A. Viscose rayon
B. Corundum
C. Plasticiser for unsaturated polyester
D. Paints

View Answer

Question 255

Graphite is a/an

A. Electrical insulator
B. Allotrope of carbon
C. Moderator used in nuclear reactor
D. Both B and C

View Answer

Question 256

Deaeration of water in its treatment is necessary, as it

A. Minimises its turbidity
B. Helps in controlling its taste and odour
C. Minimises its corrosiveness
D. None of these

View Answer

Question 257

Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

A. Its calorific value is very less
B. Tar neutralises the residual acids present in pitch
C. It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop
D. All of the above

View Answer

Question 258

Most widely and commonly used coagulant for the removal of suspended impurities in water is

A. Bleaching powder
B. Slaked lime
C. Alum
D. Copper sulphate

View Answer

Question 259

Which of the following sugars is the sweetest?

A. Glucose
B. Fructose
C. Sucrose
D. Lactose

View Answer

Question 260

Exothermic neutralisation reaction between caustic soda and dodecylbenzene sulphonic acid produces sodium dodecylbenzene sulphate, which is a/an

A. Explosive
B. Soap
C. Detergent
D. Analgesic drug

View Answer

Question 261

Concentration of sulphide ores is done usually by

A. Roasting
B. Smelting
C. Froth floatation
D. Electro magnetic separation

View Answer

Question 262

Nitrile rubber is produced by the polymerisation of

A. Acrylonitrile and butadiene
B. Acrylonitrile and styrene
C. Isobutylene and isoprene
D. None of these

View Answer

Question 263

Haemoglobin is a/an

A. amino acid
B. biological catalyst
C. protein
D. enezyme

View Answer

Question 264

In Kraft process of paper manufacture, white cooking liquor consists of caustic soda

A. Sodium sulphide & sodium carbonate
B. Sodium sulphite & sodium carbonate
C. Sodium sulphite & sodium sulphide
D. None of these

View Answer

Question 265

Nitrogen is an essential component of

A. Mineral salts
B. Carbohydrates
C. Fats
D. Proteins

View Answer

Question 266

Solvay process is used for the manufacture of

A. Caustic soda
B. Soda ash
C. Caustic potash
D. Soda lime

View Answer

Question 267

Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo?

A. Depithing
B. Digestion
C. Bleaching
D. None of these

View Answer

Question 268

Cation exchanger is regenerated usually with

A. NaOH
B. H₂SO₄
C. Hydrazine
D. Alum solution

View Answer

Question 269

Presence of H₂S in raw water (to be chlorinated) results in the

A. Reduced softening capacity of zeolite
B. Increased dosage of chlorine to provide a disinfecting residual in the water
C. Easy removal of its hardness
D. None of these

View Answer

Question 270

In the Lurgi coal gasifier

A. Coking coals cannot be used
B. Low carbon conversion efficiency is achieved
C. Entrainment of solids is higher
D. Large quantity of coal can be processed

View Answer

Question 271

The most stable allotropic form of phosphorous is the __________ phosphorous.

A. White
B. Black
C. Yellow
D. Red

View Answer

Question 272

Oil is a/an

A. Mixture of glycerides
B. Mixture of glycerides of fatty acids
C. Solid at normal temperature
D. Ester of alcohols other than glycerine

View Answer

Question 273

Dehydrogenation of isopropanol produces

A. Propyl alcohol
B. Acetone
C. Trichloroethylene
D. Formaldehyde

View Answer

Question 274

Styrene is produced from ethyl benzene by the process of

A. dehydrogenation
B. oxidation
C. alkylation
D. dehydration

View Answer

Question 275

Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

A. its calorific value is very less.
B. tar neutralises the residual acids present in pitch.
C. it reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop.
D. all (a), (b) and (c).

View Answer

Question 276

Permanent hardness of water can be removed by

A. Simply boiling
B. Adding alum
C. Passing it through cation & anion exchangers
D. All of the above

View Answer

Question 277

The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to

A. Avoid mechanical weakening of fibre
B. Remove lignin by way of crystallisation
C. Increase the cellulose content
D. None of these

View Answer

Question 278

Triple superphosphate is manufactured by reacting

A. Phosphate rock with phosphoric acid
B. Phosphate rock with sulphuric acid
C. Phosphate rock with nitric acid
D. Ammonium phosphate with phosphoric acid

View Answer

Question 279

Bleaching action of bleaching powder is due to its __________ properties.

A. Reducing
B. Oxidising
C. Disinfecting
D. None of these

View Answer

Question 280

Transparent soaps (e.g. Pears) are

A. Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency
B. Metallic soaps with frothing agent and free stearic acid to achieve transparency
C. Metallic soaps with frothing agent from which glycerine has not been recovered
D. None of these

View Answer

Question 281

Pick out the wrong statement.

A. Pasteurisation of milk involves moderate heating followed by cooling
B. Bakeries and breweries make use of yeasts
C. Enzyme is a complex nitrogenous compound
D. Oils and fats are alkaloids

View Answer

Question 282

Chalcopyrite is the main ore of

A. Copper
B. Lead
C. Tin
D. Iron

View Answer

Question 283

Basic oxide is absent in __________ glass.

A. Flint
B. Pyrex
C. Quartz
D. All of the above

View Answer

Question 284

Rosin soap is added during paper manufacture to

A. Impart adhesive properties
B. Improve opacity
C. Impart resistance to penetration by liquids
D. None of these

View Answer

Question 285

Resistance to fusion of the refractory under a steady rising temperature condition is called

A. Spalling
B. Refractoriness
C. Both A & B
D. Neither A nor B

View Answer

Question 286

White phosphorous is stored under water, because

A. It does not react with water
B. It is poisonous
C. Its kindling temperature in dry air is very low
D. It is unstable

View Answer

Question 287

Direct conversion of chemical energy into electrical energy is done in a

A. Magnetohydrodynamic (MHD) generator
B. Fuel cell
C. Fast breeder reactor
D. None of these

View Answer

Question 288

__________ is a polysacchride.

A. Maltose
B. Starch
C. Sucrose
D. Glucose

View Answer

Question 289

Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have

A. High electrical insulation properties
B. Sharp melting points
C. Low co-efficient of thermal expansion
D. Compressive strength much greater than their tensile strengths

View Answer

Question 290

Dacron (or terylene) fibres as compared to nylon's fibres have

A. Better heat & acid resistant properties
B. Poorer resistance to alkalis
C. Poorer dyeability
D. All of the above

View Answer

Question 291

Catalytic oxidation-dehydrogenation of methyl alcohol produces

A. Formaldehyde
B. Phenol
C. Acetone
D. Maleic anhydride

View Answer

Question 292

Neoprene is chemically known as

A. Polybutadiene
B. Styrene butadiene rubber (SBR)
C. Polyurathane
D. Polychloroprene

View Answer

Question 293

Free alkali in a toilet soap is __________ that in a laundary shop.

A. Less than
B. More than
C. Same
D. None of these

View Answer

Question 294

Antibiotic

A. Inhibits/destroys the growth of microorganisms
B. Is used as a pain reliever
C. Is an antimalarial
D. Is an anaesthetic

View Answer

Question 295

Fourdrinier machine is used in the manufacture of

A. Sugar
B. Paper
C. Alcohol from molasses
D. Phenol formaldehyde

View Answer

Question 296

Comparing sulphate process with sulphite process, we find that __________ in the later.

A. Both temperature & pressure in the former is less than that
B. Both temperature & pressure in the former is more than that
C. Temperature is more in the former whereas pressure is more
D. Pressure is more in the former whereas temperature is less

View Answer

Question 297

Permanent hardness of water can be removed by

A. Boiling
B. Adding Ca(OH)₂
C. Boiling it with Na₂CO₃
D. None of these

View Answer

Question 298

Le-Blanc process is a primitive process for the manufacture of

A. Caustic soda
B. Soda ash
C. Bromine from sea water
D. Hydrochloric acid

View Answer

Question 299

Liquor poisoning generally occurs due to the presence of __________ in it.

A. Ethyl alcohol
B. Impurities
C. Methyl alcohol
D. Carbonic acid

View Answer

Question 300

Which of the following is not a raw material used for the manufacture of ordinary glass?

A. Iron oxide
B. Soda ash
C. Limestone
D. Silica

View Answer

Question 301

Carboxymethyl cellulose (CMC) is added in detergents to

A. Prevent redeposition of soil on cleaned surface
B. Act as optical brightening agent
C. Inhibit corrosion in washing machines made of aluminium
D. None of these

View Answer

Question 302

Linde process of gas liquefaction employs

A. Exchange of heat with colder stream
B. Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
C. Adiabatic expansion against a piston or in a turbine
D. Merely compressing the gas beyond its critical pressure

View Answer

Question 303

Purity of oxygen used for blowing in steel making L.D. converter is 99.5%. The boiling point of oxygen is about __________ °C.

A. -53
B. -103
C. -183
D. -196

View Answer

Question 304

An alkali metal salt of palmitic acid is known as

A. Soap
B. Metallic soap
C. Detergent
D. Alkaloid

View Answer

Question 305

Lubricating greases are a mixture of

A. Mineral oil, soap and additives
B. Mineral oil and metallic soap
C. Mineral oil and fatty oil
D. Fatty oil and metallic soap

View Answer

Question 306

Which of the following processes is absent in glass manufacturing process?

A. Sintering
B. Annealing
C. Shaping or forming
D. Melting

View Answer

Question 307

Nylon 6-6 is manufactured from

A. Hexamethylene diamine and adipic acid
B. Hexamethylene diamine and maleic anhydride
C. Caprolactum
D. Dimethyl terephthalate and ethylene glycol

View Answer

Question 308

__________ is an ore of lead.

A. Quartz
B. Galena
C. Siderite
D. Chalcopyrite

View Answer

Question 309

Which of the following has sodium bicarbonate as its main constituent ?

A. Baking soda
B. Baking powder
C. Washing soda
D. None of these

View Answer

Question 310

Phenol is mainly used

A. To produce benzene
B. To produce phenol formaldehyde
C. To produce polyester resin
D. As a plasticiser for unsaturated polyster

View Answer

Question 311

Which of the following is used as a coagulant in treating turbid water?

A. Chlorine
B. Ferric sulphate
C. Calcium sulphate
D. Activated carbon

View Answer

Question 312

Styrene (a monomer for the production of polystyrene) is commercially produced by

A. Catalytic dehydrogenation of ethyl benzene
B. Dehydration of ethyl alcohol followed by hydrogenation
C. Reacting ethylene oxide with acetal-dehyde
D. Fermentation of starch

View Answer

Question 313

One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to

A. Adjust the pH of the syrup
B. Remove the coloring matter from the syrup
C. Reduce the viscosity of the syrup
D. Improve the rate of crystallisation of sugar

View Answer

Question 314

__________ is a thermosetting plastic.

A. Polythene
B. Epoxy polymer
C. P.V.C.
D. Polystyrene

View Answer

Question 315

Styrene-butadiene-rubber (SBR) as compared to natural rubber has

A. Poorer tensile strength
B. Poorer resistance to oxidation
C. Greater amount of heat build-up under heavy loading
D. All of the above

View Answer

Question 316

The chamber process is

A. Preferred over contact process for producing 98 to 100% H₂SO₄ and various oleums
B. Non-catalytic and operates only on pyrites
C. A batch process for directly producing high strength (98 to 100%) H₂SO₄
D. None of these

View Answer

Question 317

Fumigant insecticides

A. Kill insects, when they eat it
B. Emit poisonous vapour
C. Are absorbed throughout the plant
D. None of these

View Answer

Question 318

Fat dispersed in water is exemplified by

A. Colloids
B. Gel
C. Butter
D. Emulsion

View Answer

Question 319

Hydrophilic group of a soap or detergent solution is

A. Water hating
B. Soil loving
C. Water loving
D. None of these

View Answer

Question 320

Fusion of bauxite and __________ produces high alumina cement.

A. Alum
B. Limestone
C. Coke
D. Quartz

View Answer

Question 321

Aryl benzene sulphonate (ABS) is a

A. Detergent
B. Plasticiser for unsaturated polyester
C. Starting material for the synthesis of glycerine
D. Coating ingredient for photographic film

View Answer

Question 322

Boiling of water containing temporary hardness produces

A. CO₂
B. CaSO₄
C. CaHCO₃
D. None of these

View Answer

Question 323

The main product of high temperature carbonisation of coal is

A. Coke
B. Ammonia
C. Tar
D. Phenol

View Answer

Question 324

High temperature carbonisation of coal produces

A. Inferior coke compared to low temperature carbonisation
B. Less of gases compared to liquid products
C. Larger quantity of tar compared to low temperature carbonisation
D. None of these

View Answer

Question 325

Which of the following is not a food additive?

A. Citric acid
B. Invertage
C. Benzoyl peroxide
D. Ammonium chloride

View Answer

Question 326

Concentration of NaOH solution produced by diaphragm electrolytic cell is about __________ percent.

A. 10
B. 25
C. 50
D. 98

View Answer

Question 327

Pencillin is made employing __________ fermentation process.

A. Continuous
B. Aerobic batch
C. Anaerobic batch
D. None of these

View Answer

Question 328

Washing soda is chemically represented by

A. Na₂CO₃
B. Na₂CO₃.H₂O
C. Na₂CO₃.10H₂O
D. NaHCO₃

View Answer

Question 329

Which of the following is an organo-metal-lic compound ?

A. Isopropyl alcohol
B. Tetra-ethyl lead
C. Zeolite
D. Cumene

View Answer

Question 330

Presence of sodium tripolyphosphate (an additive) in synthetic detergent

A. Facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions)
B. Inhibits its corrosive effects
C. Does not allow redeposition of dirt on the cleaned surface
D. None of these

View Answer

Question 331

The purpose of adding Na₂CO₃ to water of low alkalinity is to

A. Permit the use of alum as a coagulant
B. Increase the softening capacity of zeolite
C. Facilitate easy regeneration of zeolite
D. All of the above

View Answer

Question 332

Neon gas is

A. flammable in nature.
B. used in color discharge tube.
C. filled in lamps having tungsten filament.
D. all (a), (b) and (c).

View Answer

Question 333

Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture.

A. CaO
B. MnO2
C. ZnO
D. FeS

View Answer

Question 334

Sucrose content in the raw juice extracted from sugar cane is about __________ percent.

A. 01-Feb
B. 15 - 20
C. 50 - 60
D. 80 - 85

View Answer

Question 335

Which of the following is not responsible for causing permanent hardness of water?

A. Ca(HCO₃)₂
B. CaCl₂
C. MgCl₂
D. None of these

View Answer

Question 336

Sucrose content in the raw juice extracted from sugar cane is about __________ percent.

A. 1 - 2
B. 15 - 20
C. 50 - 60
D. 80 - 85

View Answer

Question 337

The most popular and common detergent i.e., alkyl benzene sulfonate (ABS) is a/an __________ detergent.

A. Cationic
B. Anionic
C. Amphoteric
D. Semi polar

View Answer

Question 338

Fermentation is adversely affected by the

A. Presence of air
B. Absence of air
C. High concentration
D. Presence of ammonium salts

View Answer

Question 339

For the hydrogenation of oils (i) __________ is commonly used as catalyst and (ii) __________ is a catalyst poison.

A. (i) platinum (ii) sulphur
B. (i) palladium (ii) oxygen
C. (i) nickel (ii) sulphur
D. (i) nickel (ii) oxygen

View Answer

Question 340

Catalyst used during the manufacture of 'Vanaspati Ghee' is

A. Zinc
B. Nickel
C. Platinum
D. Copper

View Answer

Question 341

Pick out the wrong statement.

A. Low intensity explosives are also called propellants, whereas high intensity explosive are called detonators
B. Gun powder comprises of 75% salt petre, 15% charcoal and 10% sulphur
C. Lead azide is a popular military explosive
D. TNT is a hygroscopic explosive having very high melting point and is non-toxic to human being

View Answer

Question 342

Chloramines are used in water treatment for

A. Disinfection and control of taste & odour
B. Corrosion control
C. Removing turbidity
D. Control of bacteria

View Answer

Question 343

Chemical name of aspirin (an analgesic drug) is

A. Acetylsalicylic acid
B. Nictonic acid
C. Calcium acetate
D. Methyl salicylate

View Answer

Question 344

Dry ice (solidified CO₂) is used for the

A. Storage & shipment of frozen foods and ice-creams
B. Liquefaction of permanent gases
C. Liquefaction of natural gas
D. None of these

View Answer

Question 345

Starting raw material for the manufacture of maleic anhydride is

A. N-butene
B. Benzene
C. Either A or B
D. Neither A nor B

View Answer

Question 346

The combustion reaction, C + O₂ = CO₂, is

A. Exothermic
B. Endothermic
C. Autocatalytic
D. None of these

View Answer

Question 347

Silicone is a/an

A. Thermoplastic
B. Inorganic polymer
C. Monomer
D. None of these

View Answer

Question 348

Which is the most suitable dye for synthetic fibres?

A. Acid dye
B. Azoic dye
C. Pigment dye
D. Mordant dye

View Answer

Question 349

Which of the following is not produced commercially from sea water?

A. Magnesium & potassium compounds
B. Common salt
C. Bromine
D. Iodine

View Answer

Question 350

Styrene-butadiene-rubber (SBR) as compared to natural rubber has

A. Poorer tensile strength.
B. poorer resistance to oxidation.
C. greater amount of heat build-up under heavy loading.
D. all (a), (b) and (c).

View Answer

Question 351

Black liquor is converted into white liquor by

A. Evaporation and burning the concentrate followed by causticisation of products
B. Multi-effect evaporation only
C. Selective liquid extraction
D. Extractive distillation

View Answer

Question 352

Hydrogenation of oil does not

A. Remove double bonds
B. Raise its melting point
C. Improve its resistance to oxidation
D. None of these

View Answer

Question 353

Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

A. poor oxidation stability and high gum forming tendency.
B. greater tendency of decomposition at elevated temperature.
C. hydrolysis tendency in presence of water.
D. all (a), (b) and (c).

View Answer

Question 354

Blue colour is imparted to glass by the addition of

A. FeSO₄
B. PbO
C. CaO
D. NaOH

View Answer

Question 355

Calcareous & argillaceous materials are used in the manufacture of

A. Lead
B. Cement
C. Carbon disulphide
D. None of these

View Answer

Question 356

__________ is obtained as a by-product in the manufacture of sodium hydroxide using brine.

A. Chlorine
B. Ammonium chloride
C. Sodium carbonate
D. Sodium bi-carbonate

View Answer

Question 357

Metallic soap (e.g. aluminium or calcium salts of fatty acids) can be used

A. As a lubricant
B. As a rust preventive
C. In hard water for cleaning of cloth
D. As a foam depressant in distillation column

View Answer

Question 358

Which of the following contains least amount of N₂?

A. Coke oven gas
B. Blast furnace gas
C. Producer gas
D. Water gas (blue gas)

View Answer

Question 359

Which of the following is not an antibiotic?

A. Penicillin
B. Streptomycin
C. Tetracyclin
D. Quinine

View Answer

Question 360

Dacron is a

A. Condensation product of hexam-ethylene diamine and adipic acid
B. Thermosetting material
C. Condensation product of dimethyl terephthalate and ethylene glycol
D. None of these

View Answer

Question 361

Styrene butadiene rubber (SBR) is

A. A natural rubber
B. A synthetic polymer
C. A synthetic monomer
D. Another name of silicone rubber

View Answer

Question 362

Pick out the wrong statement pertaining to the soap manufacture.

A. Transparent soaps are made by cold process
B. Organic pigments are used as colouring materials in the soap manufacture
C. Both laundary as well as toilet soaps are manufactured by hot process
D. Colourless rosin is used in the manufacture of laundary soaps

View Answer

Question 363

__________ process is used for the commercial production of nitric acid by the catalytic oxidation of ammonia.

A. Solvay
B. Ostwald's
C. Haber's
D. None of these

View Answer

Question 364

Bakelite is

A. Same as poly tetrafluoroethylene (PTFE)
B. An inorganic polymer
C. Same as thermosetting phenol-formaldehyde
D. Not a polymer

View Answer

Question 365

Salt cake is chemically represented by

A. Na2SO4
B. CaSO4.H2O
C. MgSO4
D. BaSO4

View Answer

Question 366

Unsaturated oils compared to saturated oils have

A. Lower melting point & higher reactivity to oxygen
B. Higher melting point & higher reactivity to oxygen
C. Lower melting point & lower reactivity to oxygen
D. Higher melting point & lower reactivity to oxygen

View Answer

Question 367

Bitterns is a/an

A. Unsaturated fat
B. Starting material for the production of iodine
C. By-product of chlor-alkali industry
D. None of these

View Answer

Question 368

In the manufacture of H₂SO₄, vanadium catalyst as compared to platinum catalyst

A. Gives higher conversion efficiency
B. Has a longer life and is not poisoned by arsenic
C. Handles lower SO₂ content gas (7 -10% SO₂), thus increasing the capital cost of the plant
D. All of the above

View Answer

Question 369

Average sulphur content in Indian pyrites is about __________ percent.

A. 15
B. 35
C. 55
D. 70

View Answer

Question 370

Chemical formula of 'salt cake' is

A. Na₂SO₄
B. CaSO₄
C. MgSO₄
D. BaSO₄

View Answer

Question 371

Commercially ethylene is produced from naphtha by

A. Catalytic cracking
B. Catalytic dehydrogenation
C. Pyrolysis
D. Hydrocracking

View Answer

Question 372

Use of hydrated lime in water treatment

A. Before filtration, reduces the bacterial load on filters
B. After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂
C. Is to adjust the pH value
D. All of the above

View Answer

Question 373

Na₂CO₃.10H₂O is called

A. Washing soda
B. Soda ash
C. Slaked lime
D. Quicklime

View Answer

Question 374

Pick out the wrong statement.

A. Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80%
B. Contact process of sulphuric acid manufacture produces pure acid of concentration ≥ 98%
C. 75% oleum can be produced by distillation of 20% oleum
D. Contact process of sulphuric acid manufacture uses nickel as the catalyst

View Answer

Question 375

Industrial production of chloroform requires acetone and

A. Phosgene
B. Calcium hypochlorite
C. Chlorine
D. Ammonium chloride

View Answer

Question 376

Zeolite used in water softening process (cation exchange) is regenerated by washing with

A. Brine
B. Chloramines
C. Sodium bisulphite
D. Liquid chlorines

View Answer

Question 377

__________ process is used for producing soda ash.

A. Chamber
B. Chance
C. Tromp
D. Solvay

View Answer

Question 378

With increase in temperature, the equilibrium constant at constant pressure (Kp) for oxidation of sulphur dioxide

A. Increases
B. Increases linearly
C. Decreases
D. Decreases linearly

View Answer

Question 379

Stereospecific agents are exemplified by

A. Radiation
B. Supported metal oxide catalysts
C. Ziegler catalysts
D. All of the above

View Answer

Question 380

Sodium carbonate (soda ash) is not used in the manufacture of

A. Fire extinguishers
B. Sugar
C. Baking powder
D. Detergents

View Answer

Question 381

Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate

A. Is prone to thermal decomposition
B. Has high water solubility and is unstable
C. Is soluble in ammonium chloride and potassium chloride solution
D. All of the above

View Answer

Question 382

Hydrazine is used in water treatment for the removal of

A. Colloidal impurities
B. Dissolved oxygen
C. Turbidity
D. Chlorinous taste

View Answer

Question 383

Polymerisation product of C₂F4 (carbon tetraflouride) is called P.T.F.E (poly chloro tetra flouro ethylene). It is also called

A. Polyurethane
B. Silicone
C. Teflon
D. Epoxy resin

View Answer

Question 384

Addition of calcium oxide to water produces

A. Exothermic heat
B. Hissing sound
C. Slaked lime
D. All of the above

View Answer

Question 385

__________ is an ore concentrating metallurgical process involving a chemical change.

A. Electromagnetic separation
B. Froth floatation
C. Roasting
D. None of these

View Answer

Question 386

Which of the following is not an abrasive material ?

A. Bakelite
B. Pumice
C. Corundum
D. Carborundum

View Answer

Question 387

Pick out the wrong statement.

A. Fibrillation of fibre during paper manufacture is done to develop the strength in paper
B. Alkali consumption in digestion/cooking of bamboo is measured in terms of permangnate number
C. Bagasse fibre contains both lignin & cellulose
D. Presence of sodium sulphate in pulp makes the pulp bleachability poor

View Answer

Question 388

Nitroglycerene absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as a controlled explosive called dynamite. The raw material used for its manufacture are glycerene, nitric acid and

A. Sulphuric acid
B. Phosphoric acid
C. Hydrochloric acid
D. Hydroflouric acid

View Answer

Question 389

Sizing material is incorporated in paper to

A. Impart resistance to penetration by liquids
B. Increase its thickness
C. Increase its flexibility & opacity
D. Increase its brightness

View Answer

Question 390

Commercial production of calcium carbide requires limestone and __________ as raw materials.

A. Coke
B. Sand
C. Soda ash
D. Fuel oil

View Answer

Question 391

Which of the following is the second major component of cement?

A. Al₂O₃
B. SiO₂
C. CaO
D. Fe₂O₃

View Answer

Question 392

Zeolite is a/an

A. Naturally occuring clay which is capable of exchanging cations
B. Abrasive material
C. Catalyst used in shift conversion
D. None of these

View Answer

Question 393

Lithopaneis

A. Explosive
B. White lead
C. Filter aid
D. ZnS (white pigment)

View Answer

Question 394

Glauber's salt is chemically represented by

A. Na₂SO₄.10H₂O
B. CaCl(OCl)
C. CaSO₄.H₂O
D. (NH₄)₂SO₄

View Answer

Question 395

Grignard reagent is chemically known as

A. Ethyl magnesium chloride
B. Methyl magnesium chloride
C. Dichlorophenol
D. Monochloro acetic acid

View Answer

Question 396

Fats as compared to oils have

A. More unsaturated glycerides of fatty acids
B. Less unsaturated glycerides of fatty acids
C. Much higher reactivity to oxygen
D. Lower melting point

View Answer

Question 397

Main constituents of portland cement are calcium aluminate and

A. Gypsum
B. Silicates
C. Sodium silicate
D. Carbonates

View Answer

Question 398

Hydrochloric acid is also known as

A. Oil of vitriol
B. Muriatic acid
C. Strong organic acid
D. Green acid

View Answer

Question 399

Which of the following is used as a binding material in soap to improve soap texture?

A. Rosin
B. Borax
C. Benzyl acetate
D. Sodium carbonate

View Answer

Question 400

In sulphate pulp manufacture, the pressure and temperature in the digestor is

A. 10 atm., 800 °C
B. 10 atm., 170-180°C
C. 1 atm., 170 - 180°C
D. l atm., 800°C

View Answer

Question 401

Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.

A. Coke and sand
B. Brine and coal
C. Coke and caustic soda
D. None of these

View Answer

Question 402

The major constituents of glass are

A. Lime, clay and soda ash
B. Sand, lime and soda ash
C. Silica, alumina and clay
D. Silica, alumina and soda ash

View Answer

Question 403

__________ are added in lacquers to remove film brittleness and to improve adhereness.

A. Film forming materials
B. Plasticisers
C. Diluents
D. Solvents

View Answer

Question 404

Catalyst used in the hydrogenation of oil is

A. Nickel
B. Platinum
C. Iron
D. Alumina

View Answer

Question 405

Claude process of gas liquefaction employs

A. Merely compression of gas beyond its critical pressure
B. Joule-Thomson expansion cooling
C. Heat exchange with colder stream
D. Adiabatic expansion against a piston or in a turbine

View Answer

Question 406

Naphthols are derivates of

A. Methyl amine
B. Naphthalene
C. Phenol
D. Xylene

View Answer

Question 407

__________ nature of hypo (sodium thiosulphate) makes it useful in photography.

A. Oxidising
B. Reducing
C. Complex forming
D. Photochemical

View Answer

Question 408

Function of thinner in a paint is to

A. Accelerate the oxidation of oil
B. Prevent gelling of the paint
C. Suspend pigments & dissolve film forming materials
D. Form a protective film

View Answer

Question 409

Parathion and Malathion are

A. Pesticides
B. Plasticisers for unsaturated polysters
C. Pain-relieving drugs (analgesic)
D. Tranquilisers

View Answer

Question 410

Sand and __________ is fused at 1300°C, to produce sodium silicate.

A. Limestone
B. Soda ash
C. Coke
D. Sodium sulphate

View Answer

Question 411

CaSO₄ .1/2 H₂O is known as

A. Blue vitriol
B. Plaster of Paris
C. Gypsum
D. Zeolite

View Answer

Question 412

Good quality of edible salt is obtained from brine by the process of

A. Solar evaporation
B. Vacuum evaporation
C. Freeze drying
D. Electrolysis

View Answer

Question 413

A bio-catalyst produced by living cells which acts independent of the cell is called a/an

A. Substrate
B. Enzyme
C. Nutrient
D. None of these

View Answer

Question 414

Polycaprolactum is commercially known as

A. nylon-6
B. nylon-66
C. dacron
D. rayon

View Answer

Question 415

Molecular weights of polymers are in the range of

A. 10² - 10²
B. 10⁵ - 10⁹
C. 10² - 10⁷
D. 10⁹ - 10¹¹

View Answer

Question 416

Which of the following is not a pyrite ore?

A. Celestite
B. Galena
C. Gypsum
D. Siderite

View Answer

Question 417

__________ glass is used for the manufacture of optical glass.

A. Pyrex
B. Soda
C. Flint
D. Crooke's

View Answer

Question 418

Oxidation of SO₂ to SO₃ is favoured by

A. Low temperature and low pressure
B. Low temperature and high pressure
C. High temperature and low pressure
D. High temperature and high pressure

View Answer

Question 419

Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials.

A. adsorbs
B. oxidises
C. reduces
D. converts

View Answer

Question 420

Essential oils are usually obtained using

A. Steam distillation
B. Extractive distillation
C. Solvent extraction
D. Leaching

View Answer

Question 421

The end bleaching agent used to move last traces of colour bodies from the pulp is

A. Chlorine dioxide (ClO₂)
B. MgO
C. SO₂ gas
D. Mercaptans

View Answer

Question 422

Hydrogenation of edible vegetable oils

A. Is an exothermic reaction
B. Increases their melting point
C. Is done in presence of nickel catalyst
D. All of the above

View Answer

Question 423

Bordeaux mixture is a/an

A. Fertiliser
B. Inorganic fungicide
C. Insecticide
D. Explosive

View Answer

Question 424

Pick out the wrong statement. Iodine value of an oil or fat is

A. The number of grams of iodine taken up by 100 gm of oil or fat
B. A measure of its unsaturation
C. Helpful in findings its adulteration & its suitability for making soap
D. Independent of the type of oil, whether it is drying or non-drying

View Answer

Question 425

Contact process of sulphuric acid manufacture

A. Yields acid of higher concentration than chamber process
B. Yields acids of lower concentration than chamber process
C. Is obsolete
D. Eliminates absorber

View Answer

Question 426

Ultimate analysis of coal determines its __________ content.

A. Carbon, hydrogen, nitrogen & sulphur
B. Carbon, ash, sulphur & nitrogen
C. Carbon, sulphur, volatile matter & ash
D. Carbon, volatile matter, ash & moisture

View Answer

Question 427

Nylon-6 is manufactured from

A. Caprolactum
B. Hexamethylene diamine and adipic acid
C. Hexamethylene diamine and maleic anhydride
D. Hexamethylene diamine and sebacic acid

View Answer

Question 428

Inversion of sucrose produces

A. Fructose
B. Glucose
C. Both A & B
D. Neither A nor B

View Answer

Question 429

Phosphoric acid is prepared from

A. Cryolite
B. Chalcopyrite
C. Rock phosphate
D. None of these

View Answer

Question 430

The combustion reaction, C + O2 = CO2, is

A. exothermic
B. endothermic
C. autocatalytic
D. none of these

View Answer

Question 431

Most commonly used rubber vulcanising agent is

A. Sulphur
B. Bromine
C. Platinum
D. Alumina

View Answer

Question 432

Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C.

A. -83
B. -183
C. -196
D. -218

View Answer

Question 433

Common salt is generally not produced commonly by __________ method from brine.

A. Freeze drying
B. Electrolytic
C. Solar evaporation
D. Vacuum evaporation

View Answer

Question 434

Which of the following is an yellow pigment?

A. Titanium dioxide
B. Ferrous sulphate
C. Lead chromates
D. Zinc sulphides

View Answer

Question 435

The product obtained on mixing calcium oxide with water is called

A. Quicklime
B. Slaked lime
C. Milk of lime
D. None of these

View Answer

Question 436

__________ acid is an unsaturated fatty acid.

A. Palmitic
B. Oleic
C. Stearic
D. Oxalic

View Answer

Question 437

Solvay process as compared to dual process (i.e. modified Solvay process)

A. Can use low grade brine
B. Has less corrosion problems
C. Involves higher investment in NH₃ recovery units than that for crystallisation units for NH₄Cl
D. Both B and C

View Answer

Question 438

Type of glass used in optical work is the __________ glass.

A. Soda-lime
B. Fibre
C. Lead
D. Borosilicate

View Answer

Question 439

Lindane is

A. Not a fumigant
B. BHC (Benzene Hexa Chloride) containing 99% γ-isomer
C. A by-product of BHC manufacture
D. Both B and C

View Answer

Question 440

Coagulant is used __________ filtration.

A. Before
B. After
C. During
D. To avoid

View Answer

Question 441

Air used in aerobic fermentation must be sterilized, otherwise the

A. Recovery of product will be difficult
B. Contamination of pure culture would result
C. Uniformity of product cannot be achieved
D. None of these

View Answer

Question 442

Gypsum is chemically

A. Calcium chloride
B. Potassium sulphate
C. Sodium sulphate
D. Calcium sulphate

View Answer

Question 443

Synthesis gas is a mixture of

A. CO and H₂
B. N₂ and H₂
C. H₂, CH₄ and CO
D. CO₂ and H₂

View Answer

Question 444

RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically

A. Cyclo trimethylene trinitramine
B. Trinitro resorcinol
C. Cyclo tetramethylene tetranitramine
D. Trinitro benzene

View Answer

Question 445

Oleum produces fumes of

A. SO₂
B. H₂SO₄
C. SO₃
D. SO₂ + H₂SO₄

View Answer

Question 446

The main use of HCl is in the

A. Drilling of petroleum wells and pickling of steel sheets
B. Manufacture of cationic detergent
C. Treatment of spent fuel of nuclear reactor
D. None of these

View Answer

Question 447

Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it

A. Has larger production capacity per unit cell
B. Consumes less power per ton of Cl₂ produced
C. Produces high purity (70%) caustic soda directly
D. All of the above

View Answer

Question 448

Calcination of limestone is not done in a __________ kiln for producing lime.

A. Vertical shaft
B. Rotary
C. Fluidised bed
D. Fixed bed

View Answer

Question 449

Very fine suspended and colloidal impurities are removed from water by a process called

A. sedimentation
B. coagulation
C. disinfection
D. softening

View Answer

Question 450

Which of the following impurities in feed water for high pressure boiler is the most detrimental?

A. Silica
B. Dissolved oxygen
C. Suspended salt
D. Dissolved salt

View Answer

Question 451

Cement setting under water employs a/an __________ process.

A. Hydration
B. Decomposition
C. Oxidation
D. Reduction

View Answer

Question 452

Pick out the endothermic reaction out of the following.

A. C+1/2O₂ = CO
B. CO + 3H₂ = CH₄ + H₂O
C. CaCO₃ = CaO + CO₂
D. CO +1/2O₂ = CO₂

View Answer

Question 453

Builders are added in soap to act as

A. Cleaning power booster
B. Anti-redeposition agent
C. Corrosion inhibitor
D. Fabric brightener

View Answer

Question 454

Cumene is the starting material for the production of

A. Benzoic acid
B. Phenol and acetone
C. Isoprene
D. Styrene

View Answer

Question 455

Concentration of NaOH solution produced by mercury electrolytic cell is about __________ percent.

A. 10
B. 25
C. 50
D. 98

View Answer

Question 456

An oil is converted into fat by its

A. Hydrogenation
B. Hydrolysis
C. Hydrocracking
D. Hydration

View Answer

Question 457

__________ is used as a flux in the extraction of iron from iron ore (hametite) in blast furnace.

A. Bauxite
B. Limestone
C. Quartz
D. Manganese

View Answer

Question 458

Fusel oil is a/an

A. Essential oil
B. Extract from medicinal herbs
C. Mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses)
D. None of these

View Answer

Question 459

Yeast is used in the manufacture of

A. Pencillin
B. Antibiotics
C. Wine
D. Pasteurised milk

View Answer

Question 460

Multistage catalytic converter is not used in the

A. Conversion of SO₂ to SO₃
B. NH₃ synthesis reaction
C. Both A & B
D. Neither A nor B

View Answer

Question 461

Which allotrope of sulphur is insoluble in carbon disulphide?

A. Rhombic sulphur
B. Monoclinic sulphur
C. Plastic sulphur
D. Milk of sulphur

View Answer

Question 462

Which of the following is the purest form of water out of the following ?

A. Underground water
B. Rain water
C. Well water
D. Lake water

View Answer

Question 463

High acid value of an oil or fat is an indication of

A. Storage under improper conditions
B. Absence of unsaturation
C. Its smaller molecular weight
D. None of these

View Answer

Question 464

Diaphragm electrolytic cell as compared to mercury electrolytic cell

A. Produces 70% NaOH solution
B. Requires less specific power consumption for the production of chlorine
C. Requires lesser investment for similar capacity
D. All of the above

View Answer

Question 465

The chamber process is

A. preferred over contact process for producing 98 to 100% H2SO4 and various oleums.
B. non-catalytic and operates only on pyrites.
C. a batch process for directly producing high strength (98 to 100%) H2SO4.
D. none of these.

View Answer

Question 466

Soaps remove dirt by

A. Increasing the surface tension
B. Decreasing wettability
C. Supplying hydrophyllic group
D. None of these

View Answer

Question 467

Sucrose is a

A. Monosacchride
B. Disacchride
C. Polysacchride
D. None of these

View Answer

Question 468

Which one of the following is not an elastomer?

A. Polyisoperene
B. Neoprene
C. Nitrile-butadiene
D. None of these

View Answer

Question 469

Phosphate rock is a raw material for the manufacture of

A. phosphoric acid
B. phosphorous
C. superphosphates
D. all (a), (b) and (c)

View Answer

Question 470

During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as

A. It is very corrosive at elevated temperature
B. Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)
C. It decomposes on further increasing the temperature
D. None of these

View Answer

Question 471

Setting of plaster of paris is accompanied with

A. Hydration
B. Dehydration
C. Hydrolysis
D. Loss of CO₂

View Answer

Question 472

__________ are used as corrosion inhibitor for iron & steel in aqueous solutions.

A. Phosphates
B. Chromates
C. Sulphates
D. Bi-carbonates

View Answer

Question 473

Glycerine is recovered from lye by

A. Evaporation followed by vacuum distillation
B. Liquid extraction technique
C. Extractive distillation technique
D. None of these

View Answer

Question 474

Starting material for the production of styrene butadiene rubber (SBR) is

A. Ethyl alcohol
B. Ethylene
C. Both A & B
D. Neither A nor B

View Answer

Question 475

Alcohol content in freshly prepared natural and fortified wine may be respectively around __________ percent.

A. 7-14 and 14-30
B. 7-14 and 40-50
C. 14 - 30 and 40-50
D. 10 - 20 and 40 - 50

View Answer

Question 476

__________ is produced using polycondensation reaction.

A. Polythene
B. Phenol formaldehyde
C. Poly vinyl chloride
D. None of these

View Answer

Question 477

Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?

A. High cost of mercury.
B. High specific gravity of mercury.
C. Non-availability of high purity mercury.
D. Pollution of water stream by mercury.

View Answer

Question 478

BHC (Benzene hexachloride) is made by the chlorination of benzene

A. Which is an addition reaction
B. Which is a substitution reaction
C. In absolute dark
D. In presence of sunlight

View Answer

Question 479

The most economical pulp for the production of newsprint would be the __________ pulp.

A. Groundwood
B. Sulphate
C. Sulphite
D. Semichemical

View Answer

Question 480

Sucrose is a disaccharide consisting of

A. Glucose and glucose
B. Glucose and fructose
C. Glucose and galactose
D. Fructose and galactose

View Answer

Question 481

Pick out the wrong statement.

A. Kraft method of pulp manufacture can process all types of fibrous raw materials
B. Digestion time for bagasse is less than that for wood base materials
C. Both temperature and pressure in the digestor is less in case of the sulphite method as compared to that in the sulphate method
D. None of these

View Answer

Question 482

Chemical name of 'alum' is

A. Barium sulphate
B. Aluminium sulphate
C. Aluminium chloride
D. Calcium sulphate

View Answer

Question 483

Dichloro diphenyl __________ is the full form of DDT (an insecticide).

A. Tetrachloroethane
B. Trichloroethane
C. Tetrachloromethane
D. Trichloromethane

View Answer

Question 484

Nitric acid is not used in the manufacture of

A. Detergents
B. Fertilisers
C. Aqua regia
D. Explosives

View Answer

Question 485

Na₂CO₃ is called

A. Washing soda
B. Soda ash
C. Plaster of paris
D. Calcite

View Answer

Question 486

Oils and fats are converted to soap in a process called

A. Hydrogenation
B. Esterification
C. Saponification
D. None of these

View Answer

Question 487

Gun powder uses

A. Sulphur
B. Charcoal
C. Potassium nitrate
D. All of the above

View Answer

Question 488

The gasification reaction represented by, C + H₂O = CO + H₂, is a/an __________ reaction.

A. Exothermic
B. Endothermic
C. Catalytic
D. Autocatalytic

View Answer

Question 489

Sucrose content in cane sugar may be around __________ percent.

A. 50
B. 70
C. 80
D. 95

View Answer

Question 490

Celluloid is chemically

A. Cellulose acetate
B. Regenerated cellulose
C. Cellulose nitrate
D. Cellulose acetate butyrate

View Answer

Question 491

Conversion of CO to CO₂ by steam in presence of a catalyst is called

A. Steam reforming
B. Shift conversion
C. Steam gasification
D. None of these

View Answer

Question 492

Which of the following is an endothermic reaction?

A. Absorption of SO₃ in 98% H₂SO₄
B. C + H₂O = CO + H₂
C. Thermal dissociation of iron pyrites
D. Both B and C

View Answer

Question 493

99.5% purity oxygen is used in

A. Cutting and welding by oxy-acetylene flame
B. Hospitals for medicinal purposes
C. Gas masks and artificial breathing apparatus
D. All of the above

View Answer

Question 494

Raw materials required for the manufacture of __________ is acetylene and hydrochloric acid.

A. Phthalic anhydride
B. Vinyl chloride
C. Maleic anhydride
D. Dacron

View Answer

Question 495

Which of the following is a disacchride?

A. Sucrose
B. Glucose
C. Starch
D. Maltose

View Answer

Question 496

Nickel is not used as a catalyst in the __________ reaction.

A. Shift conversion
B. Oil hydrogenation
C. Steaming reforming of naphtha
D. Ammonia cracking/dissociation

View Answer

Question 497

Pick out the wrong statement.

A. High early strength cement are made from materials having high silica to lime ratio
B. The function of gypsum in cement is to enhance its initial setting rate
C. Acid resistant cements are known as silicate cement
D. Major component of greyish portland cement is tricalcium silicate

View Answer

Question 498

Bio-degradable detergents

A. Can be readily oxidised
B. Pose problem in sewerage plant
C. Have an isoparaffinic structure
D. Should not be used as it spoils the cloth

View Answer

Question 499

Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of

A. Nitric acid
B. Hydrochloric acid
C. Methyl alcohol
D. Formic acid

View Answer

Question 500

Fusel oil is a/an

A. essential oil.
B. extract from medicinal herbs.
C. mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).
D. none of these.

View Answer

Question 501

Shaving soaps are

A. Soft potassium soaps (potassium salt of fatty acid) with free stearic acid to give lather a lasting property
B. Metalic soaps compounded with frothing agents
C. High free alkali soaps having excess of cane sugar and alcohol
D. None of these

View Answer

Question 502

Isopropyl benzene produced by alkylation of benzene with propylene is known as

A. Neoprene
B. Cumene
C. Gelatin
D. Mercaptans

View Answer

Question 503

Kaoline is a/an

A. Refractory material
B. Synthetic resin
C. Artificial abrasive
D. Blue pigment

View Answer

Question 504

Pig iron is produced by blast furnaces in India using mostly the iron ore named

A. Hematite
B. Magnetite
C. Siderite
D. Chalcopyrite

View Answer

Question 505

Pick out the wrong statement.

A. Conversion of SO₂ to SO₃ in Monsanto-4 pass converter is about 98%
B. The chemical formula of oleum is H₂S₂O₇, which is formed by saturating sulphuric acid with sulphur trioxide
C. Vitriol oil is nothing but technical sulphuric acid
D. Decomposition of sulphuric acid on heating does not start before its boiling

View Answer

Question 506

Main constituents of cotton fiber is

A. Lignin
B. Cellulose
C. Starch
D. Gelatine

View Answer

Question 507

Which of the following is not an insecticide?

A. Hydrocyanic acid
B. Nicotine
C. Sodium flouride
D. Hexane

View Answer

Question 508

Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about __________ percent.

A. 75
B. < 10
C. > 30
D. 50

View Answer

Question 509

A 'unit process' is exemplified by the

A. Distillation
B. Hydrogenation of oils
C. Absorption
D. Humidification

View Answer

Question 510

Titanium dioxide is a/an __________ colour pigment.

A. White
B. Black
C. Yellow
D. Blue

View Answer

Question 511

CO & H₂ are the constituents of

A. Producer gas
B. Water gas
C. Coke oven gas
D. All of the above

View Answer

Question 512

Hydrolysis of sugar is called

A. Hydration
B. Inversion
C. Esterification
D. None of these

View Answer

Question 513

Trinitro-toluene (TNT) is

A. Used in glycerine manufacture
B. An explosive
C. Used in dye manufacture
D. None of these

View Answer

Question 514

Laboratory glass wares which reacts with hydroflouric acid, are made of the __________ glass.

A. Lead
B. Borosilicate
C. Soda lime
D. Alkali silicate

View Answer

Question 515

Impurities present in brine is normally removed by treatment with

A. NH₃ and CO₂
B. Lime and soda ash
C. Lime, ammonia and carbon
D. All of the above

View Answer

Question 516

Salt is the basic raw material for the manufacture of

A. Cement
B. Glass
C. Potteries
D. Caustic soda

View Answer

Question 517

The enzyme which converts starch into the disacharides maltose is

A. Diastase
B. Maltase
C. Yeast
D. None of these

View Answer

Question 518

Commercial production of Vanaspati is done by __________ of edible vegetable oils.

A. Hydrogenation
B. Oxidation
C. Hydrolysis
D. Hydrocracking

View Answer

Question 519

Which one of the following is not likely to be a constituent of vegetable oils?

A. Citric acid
B. Oleic acid
C. Stearic acid
D. Glycerol

View Answer

Question 520

The major constituent of black liquor generated during paper manufacture is sodium

A. Sulphate
B. Carbonate
C. Hydroxide
D. Bi-carbonate

View Answer

Question 521

CaO is called

A. Quick lime
B. Slaked lime
C. Limestone
D. Calcite

View Answer

Question 522

Glauber's salt is chemically

A. Calcium sulphate
B. Potassium sulphate
C. Potassium chlorate
D. None of these

View Answer

Question 523

Which glass is usually used in optical work?

A. Lead glass
B. High silica (borosilicate) glass
C. Photo-sensitive glass
D. Fibre glass

View Answer

Question 524

Tall oil obtained as a by-product from the black liquor recovery is

A. A black, sticky & viscous liquid
B. Used in the manufacture of greases, emulsions & soaps
C. Composed mainly of rosin & fatty acids
D. All of the above

View Answer

Question 525

Synthetic glycerine is produced from

A. Toluene
B. Phenol
C. Propylene
D. Naphthalene

View Answer

Question 526

Concentration of hydrogen peroxide is done by

A. Crystallisation
B. Vacuum crystallisation
C. Atmospheric distillation
D. Dehydration

View Answer

Question 527

Hollander beater' machine used in the paper manufacturing plant does not accomplish the task of

A. Final rolling out of paper
B. Cutting of fibres
C. Hydration of fibres
D. Fibrillation of fibre

View Answer

Question 528

Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials.

A. Adsorbs
B. Oxidises
C. Reduces
D. Converts

View Answer

Question 529

Yellow phosphorus is transported under

A. Air
B. Water
C. Nitrogen
D. Helium

View Answer

Question 530

Carbon tetrachloride (CCl₄) is the starting raw material for the manufacture of

A. Trichloroethylene
B. Perchloroethylene
C. Parathion
D. Methanol

View Answer

Question 531

Starting raw material for the manufacture of alum is

A. alumina
B. gypsum
C. bauxite
D. ammonium bicarbonate

View Answer

Question 532

A cane sugar factory having sugar production rate of 10 tons/day will produce about __________ tons/day of bagasse (after consumption by the factory for heating etc.).

A. 1
B. 10
C. 25
D. 40

View Answer

Question 533

Cement mainly contains

A. CaO, SiO₂, Al2O₃
B. MgO, SiO₂, K₂O
C. Al2O₃, MgO, FE₂O₃
D. CaO, MgO, K₂O

View Answer

Question 534

More than 100 percent of __________ is present in oleum.

A. SO₃
B. H₂SO₄
C. H₂SO₃
D. SO₂

View Answer

Question 535

The basic difference between vegetable oils and fats is in their

A. Density
B. Chemical properties
C. Physical state
D. Composition

View Answer

Question 536

Maleic anhydride is produced by catalytic oxidation of

A. Toluene
B. Ethyl alcohol
C. Naphthalene
D. Benzene

View Answer

Question 537

Systemic insecticides

A. Are absorbed throughout the plant
B. Kill insects following external bodily contact
C. Are stomach poisons
D. Emit poisonous vapour

View Answer

Question 538

Catalytic oxidation of toluene produces

A. Styrene
B. Phenol
C. Benzene
D. Tri-nitro-toluene

View Answer

Question 539

Cellulose percentage in bamboo fibre is about

A. 10
B. 20
C. 50
D. 85

View Answer

Question 540

The compressive strength of cement should not be less than about 110Kg/cm² after three days & not less than 170Kg/cm² after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm²/gm.

A. 800
B. 1600
C. 4000
D. 8500

View Answer

Question 541

Hydrogen gas is not produced commercially (for nitrogeneous fertiliser manufacture) by

A. Iron-steam reaction
B. Electrolysis of water
C. Steam reforming of naphtha
D. Its cryogenic separation from coke oven gas

View Answer

Question 542

Low purity oxygen is used for

A. L.D. steel making
B. Cutting and welding of metals
C. Medicinal purposes
D. Chemical oxidation processes

View Answer

Question 543

Enzymes are organic catalysts used in the __________ reactions.

A. Chemical
B. Biochemical
C. Photochemical
D. Electrochemical

View Answer

Question 544

A mixture of chlorine & sodium bromide acts as a/an

A. Insecticides
B. Analgesic drug
C. Fire retardant
D. Hydrogenation catalyst

View Answer

Question 545

The yield of tar from high temperature carbonisation of dry coal is about __________ percent.

A. 3
B. 12
C. 22
D. 0.3

View Answer

Question 546

Chemical formula of oleum is

A. H₂SO₃
B. H₂SO₄
C. H₂S₂O₇
D. H₂SO₇

View Answer

Question 547

Paper pulp produced by kraft/sulphate process is

A. bleached easily
B. dull white in color
C. strong fibrous
D. dark colored

View Answer

Question 548

Reaction of calcium carbide with water produces a gas, which is used

A. As an illuminant
B. For metal cutting/welding
C. Both A & B
D. Neither A nor B

View Answer

Question 549

Analgesic drugs are

A. Pain relievers
B. Antibiotics
C. Used in the treatment of T.B.
D. Used in the treatment of typhiod

View Answer

Question 550

A unit operation is exemplified by the process of

A. Reduction
B. Desorption
C. Nitration
D. Combustion

View Answer

Question 551

Plaster of Paris is

A. CaSO₄.½H₂O
B. Used for setting of broken bones
C. Both A and B
D. Same as gypsum

View Answer

Question 552

Pasteurisation of milk means

A. removal of fatty and albuminous substance from it.
B. killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics.
C. inhibiting the growth of micro-organisms without killing them.
D. none of these.

View Answer

Question 553

Widely used method for the conditioning of boiler feed water is the

A. Cold lime process
B. Coagulation
C. Hot-lime soda process
D. Sequestration

View Answer

Question 554

The ideal pulp for the manufacture of paper should have high __________ content.

A. Cellulose
B. Lignin
C. Both A & B
D. None of these

View Answer

Question 555

Calcination of gypsum produces

A. Plaster of paris
B. Salt cake
C. Nitre cake
D. Lime

View Answer

Question 556

In an integrated steel plant, NH₃ present in coke oven gas is normally recovered as

A. (NH₄)2SO₄
B. NH₄Cl
C. (NH₄)2 NO₃
D. Liquid NH₃

View Answer

Question 557

Carbon content of pitch (residue of coal tar distillation) is around __________ percent.

A. 70
B. 55
C. 80
D. 94

View Answer

Question 558

Coke oven gas consists mainly of

A. H₂, & CH₄
B. CO, & CO₂
C. H₂, & CO
D. CH₄, & CO

View Answer

Question 559

Temporary hardness of water can be removed by

A. Addition of alum (a coagulant)
B. Boiling
C. Filtration (through gravity sand filter)
D. Addition of lime

View Answer

Question 560

Gelatine which is a nitrogenous organic protein is obtained by the hydrolysis of

A. callagen
B. tannin
C. molasses
D. carbohydrate

View Answer

Question 561

Epoxy resin

A. Is a good adhesive
B. Is an elastomer
C. Cannot be used for surface coatings
D. Is a polyester

View Answer

Question 562

Polythene is a/an __________ polymerisation product.

A. Addition
B. Condensation
C. Thermosetting
D. None of these

View Answer

Question 563

20% oleum means that in 100 kg oleum, there are 20 kg of

A. SO₃ and 80kg of H₂SO₄
B. H₂SO₄ and 80kg of SO₃
C. SO₃ for each 100 kg of H₂SO₄
D. None of these

View Answer

Question 564

Trinitrotoluene (TNT), an explosive, is made by the nitration of

A. Nitrobenzene
B. Toluene
C. Nitrotoluene
D. Benzene

View Answer

Question 565

Sugar content in sugarcane on cane basis is about __________ percent by weight.

A. 1 to 5
B. 5 to 10
C. 15 to 20
D. 20 to 30

View Answer

Question 566

Hydrocynic acid (HCN) is used as an insecticide for

A. Controlling timber degradation by ants
B. Controlling poultry lice
C. Potato beetle
D. Citrus fruits

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Question 567

Esterification reaction

A. Produces soap
B. Is reversible
C. Is a reaction between an alcohol and an organic acid
D. All of the above

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Question 568

__________ is the major constituent of the Portland cement.

A. Calcium carbonate
B. Calcium oxide
C. Tricalcium silicate
D. Calcium sulphate

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Question 569

Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture.

A. CaO
B. MnO₂
C. ZnO
D. FeS

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Question 570

The manufacture of Kraft pulp is done by a/an __________ process.

A. Alkaline
B. Acidic
C. Neutral
D. None of these

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Question 571

Oil produced by solvent extraction

A. Has low free fatty acid content
B. Is odourless
C. Both A & B
D. Neither A nor B

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Question 572

Which is the most efficient absorbant for SO₃ out of the following?

A. 20% oleum
B. 65% oleum
C. 78%H₂SO₄
D. 98%H₂SO₄

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Question 573

Fusion of limestone and __________ produces high alumina cement.

A. Sand
B. Bauxite
C. Quicklime
D. Calcite

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Question 574

Potassium is kept & transported under

A. Water
B. Liquid ammonia
C. Kerosene oil
D. Alcohol

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Question 575

The function of gypsum addition during cement making is to

A. Increase the density of cement
B. Decrease the cement setting rate
C. Both A and B
D. Neither A nor B

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Question 576

Brackish water which contains mostly dissolved salt, can be purified by the __________ process.

A. Reverse osmosis
B. Sand filter
C. Lime soda
D. Permutit

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Question 577

Phenolic antiseptics are added in the __________ soap.

A. Shaving
B. Medicated
C. Metallic
D. Transparent

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Question 578

Pick out the wrong statement.

A. Catalytic hydrogenation of carbon monoxide produces methyl alcohol
B. In nylon-6, the number 6 represents the total number of carbon atoms in the ring
C. Raw materials for DDT manufacture are benzene and chlorine
D. Ethanolamines are produced by using ammonia and ethylene oxide as raw material

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Question 579

Electrodeposition of metals i.e. electroplating is never done on

A. Metals
B. Alloys
C. Refractories
D. Non-metals

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Question 580

Main constituents of natural rubber is

A. Polystyrene
B. Polyisoprene
C. Polybutadiene
D. Polychloroprene

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Question 581

Fish contains about __________ percent oil.

A. 5
B. 10
C. 20
D. 35

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Question 582

__________ is produced using molasses as the starting raw material.

A. Methyl alcohol
B. Ethyl alcohol
C. Benzol
D. Dimethyl ether

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Question 583

Which of the following coals has the highest calorific value?

A. Lignite
B. Sub-bituminous
C. Anthracite
D. Peat

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Question 584

Alcohol is produced by the

A. Oxidation of an aldehyde
B. Hydrolysis of an ether
C. Esterification of a fat
D. None of these

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Question 585

Which of the following is not produced on commercial scale from sea water?

A. Bromine
B. Magnesium compounds
C. Potassium compounds
D. Sodium sulphate

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Question 586

Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ °C.

A. 15-30
B. 90-100
C. 250-300
D. <0

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Question 587

Sulphuric acid is mainly used in the __________ industry.

A. Fertiliser
B. Steel
C. Paper
D. Paint

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Question 588

Sulphuric acid completely saturated with sulphur trioxide is called

A. Concentrated sulphuric acid
B. Oleum
C. Sulphurous acid
D. Dilute sulphuric acid

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Question 589

Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process.

A. Mechanical
B. Sulphate/kraft
C. Sulphite
D. Neutral sulphite semi-chemical

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Question 590

Neon gas is

A. Flammable in nature
B. Used in color discharge tube
C. Filled in lamps having tungsten filament
D. All of the above

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Question 591

Main constituent of dolomite is

A. CaCO₃
B. MgCO₃
C. K₂CO₃
D. Na₂CO₃

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Question 592

Enamels

A. Give good glossy finish
B. Are same as varnish
C. Are prepared from non-drying oil
D. Do not contain pigment

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Question 593

The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by

A. Electrolysis
B. Electrolytic reduction
C. Electrolytic oxidation
D. None of these

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Question 594

DDT should not be allowed to come in contact with iron (during its manufacture) to

A. Avoid its decomposition
B. Prevent sulphonation of the monochlorobenzene by the acid catalyst
C. Achieve non-hygroscopic property
D. None of these

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Question 595

Which of the following is an organo-metal-lic compound?

A. Isopropyl alcohol
B. Tetra-ethyl lead
C. Zeolite
D. Cumene

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Question 596

Pick out the wrong statement.

A. Azoic dyes are mostly applied on cotton fabrics
B. Basic dyes (e.g. amino derivatives) are applied mostly to paper
C. Mordant dyes are applied mainly to wools
D. None of these

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Question 597

Pick out the wrong statement.

A. Hard glass which is used for making laboratory glass wares is a mixture of sodium borosilicate and aluminium borosilicate
B. Glass is decolorised during its manufac-ture by adding antimony oxide, mangnese dioxide or arsenic oxide
C. Ordinary glass is represented chemically by Na₂O . CaO . 6SiO₂
D. Red color is imparted to glass by addition of arsenic oxide

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Question 598

Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of

A. Calcium sulphate
B. Sodium chloride
C. Sodium sulphate
D. Magnesium chloride

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Question 599

Conversion of SO₂ to SO₃ in Monsanto 4-pass converter is about __________ percent.

A. 80
B. 90
C. 98
D. 100

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Question 600

Flexible foam (for mattresses) is usually made of

A. PVC
B. Silicone
C. Polyurethanes
D. Polyamides

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Question 601

The gasification reaction represented by, C + H2O = CO + H2, is a/an __________ reaction.

A. exothermic
B. endothermic
C. catalytic
D. autocatalytic

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Question 602

Detergent is produced by the sulphonation of dodecyl benzene, which is an __________ reaction.

A. Endothermic
B. Exothermic
C. Irreversible
D. Both B and C

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Question 603

Neoprene is the trade name of

A. polyurathane
B. phenol formaldehyde
C. polychloroprene
D. styrene-butadiene rubber

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Question 604

Economics of 'Solvay Process' depends upon the efficiency of

A. Carbonating tower
B. Ammonia recovery
C. Ammonia recovery and size of the plant
D. Ammoniation of salt solution

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Question 605

Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively

A. V₂O₅ & Cr₂O₃
B. Oxides of nitrogen & Cr₂O₃
C. V₂O₅ on a porous carrier & oxides of nitrogen
D. Oxides of nitrogen & V₂O₅ on a porous carrier

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Question 606

The main use of activated carbon in water treatment is to control

A. Bacterial growth
B. Taste and odour
C. Turbidity
D. None of these

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Question 607

Pick out the wrong statement.

A. Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action
B. Soap powder is prepared by mixing soap with hydrated sodium carbonate
C. Detergents differ from soaps in their action in hard water
D. Tarnish inhibitor (e.g., benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc

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Question 608

Phenol formaldehyde resin is used as an adhesive in making

A. Laminates
B. Card boxes
C. Furniture
D. Books

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Question 609

Dechlorination of treated water is necessary to

A. Remove residual turbidity
B. Reduce the bacterial load on filter
C. Control taste and odour
D. Remove chlorinous taste

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Question 610

Percentage of glycerene present in the spent lye obtained during soap manufacture is about

A. 0.5
B. 5
C. 20
D. 35

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Question 611

Nylon-6 as compared to Nylon-66 is having higher

A. Hardness
B. Abrasion/resistance
C. Melting point
D. None of these

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Question 612

Plasticisers are added to paints to

A. Make it corrosion resistant
B. Make glossy surface
C. Give elasticity & prevent cracking of the film
D. Increase atmospheric oxidation

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Question 613

Which catalyst is used in the manufacture of ethylene oxide by oxidation of ethylene?

A. AgO
B. Al2O₃
C. ZnCl₂
D. FE₂O₃

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Question 614

The main component of pyrex glass is

A. Zinc
B. Lead
C. Boron
D. Celenium

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Question 615

Frasch process is for

A. making oxygen
B. producing helium
C. mining sulphur
D. making nitrogen

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Question 616

Viscosity index improver (like polystrene or polyisobutylene) is added to lubricant to

A. Reduce its viscosity
B. Increase its viscosity
C. Reduce the variation in its viscosity with temperature
D. Increase the variation in its viscosity with temperature

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Question 617

Main product in calcium carbide-water reaction is

A. Ca(OH)₂
B. C₂H₂
C. CO₂
D. CaCO₃

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Question 618

Commonly used glass is known as the __________ glass.

A. Flint
B. Hard
C. Pyrex
D. Soda

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Question 619

Chemical name of Grignard reagent is

A. Sodium thiosulphate
B. Ethyl magnesium chloride
C. Sodium sulphite
D. Sodium bicarbonate

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Question 620

Pick out the correct statement.

A. A fat is converted into oil by its hydrogenation
B. There is no difference between a fat and an oil so far as its physical properties are concerned
C. All vegetable oils except coconut oil, contains fatty acids having more than sixteen carbon atoms
D. Vegetable oils are classified as drying, non-drying and semi drying oils depending upon their fatty acids content

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Question 621

Chloral is used in the manufacture of

A. DDT
B. BHC
C. Parathion
D. None of these

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Question 622

Vinyl chloride (CH₂ = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of

A. 4 kgf/cm² & 500°C
B. 10 kgf/cm² & 1000°C
C. 40 kg/cm² & 200°C
D. 100 kgi/cm² & 500°C

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Question 623

Pick out the exothermic reaction out of the following:

A. C + H₂O = CO + H₂
B. CaC₂ + H₂O = Ca(OH)₂ + C₂H₂
C. MgCO₃ = MgO + CO₂
D. All of the above

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Question 624

Catalyst used in the oxidation of benzene to produce maleic anhydride is

A. V₂O₅
B. Pt
C. Ni
D. Cr

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Question 625

Glass is

A. Mainly CaO
B. Subjected to galvanising
C. A super cooled liquid
D. All of the above

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Question 626

Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction?

A. Oxidation of Na+ ions
B. Oxidation of Cl- ions
C. Reduction of Na+ ions
D. Reduction of Cl- ions

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Question 627

Silicon carbide is a/an

A. Adhesive
B. Abrasive
C. Type of glass
D. Brittle material

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Question 628

__________ is a thermosetting plastic.

A. Polyvinyl chloride
B. Polythene
C. Bakelite
D. Teflon

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Question 629

__________ is used as a catalyst in fat splitting.

A. ZnO
B. Ni
C. V₂O₅
D. FeO

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Question 630

The difference between saponification value and acid value is

A. Called ester value
B. Always negative
C. Constant for all fatty oils
D. None of these

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Question 631

Sulphur addition in soap is done to

A. improve the soap texture.
B. cure pimples & dandruff.
C. fasten lather formation.
D. increase its cleansing action.

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Question 632

At a given temperature, the equilibrium yield of SO₃ obtained from the oxidation of SO₂ is proportional to (where, P = pressure of the system )

A. P
B. √P
C. P²
D. 1/P

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Question 633

H₂S is scrubbed from refinery gases by absorption using

A. Dilute H₂SO₄
B. Ethanol amine
C. Chilled water
D. Tri-butyl phosphate

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Question 634

Double Contact Double Absorption (DCDA) process is the most recent process for the manufacture of

A. Nitric acid
B. Sulphuric acid
C. Ammonium sulphate
D. Hydrochloric acid

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Question 635

Sulphuric acid solution having a specific gravity of 1.20 at room temperature is used mainly for the

A. Fertiliser manufacture
B. Car battery solution
C. Synthesis of oleum
D. Water treatment

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Question 636

Saponification value/number of an oil or fat is a measure of its

A. Fatty acid content
B. Degree of unsaturation of the fatty acids present in it
C. Average molecular weight
D. Insoluble fatty acid content

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Question 637

Prussian blue is chemically represented by

A. FeO.TiO₂
B. Ca SO₄ . 2H₂O
C. Fe₄ [Fe (CN₆)₃]
D. AlF₃ . 3NaF

View Answer

Question 638

In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the

A. Diamine and the ring
B. Dibasic acid and the ring
C. Diamine and the dibasic acid
D. None of these

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Question 639

Superior quality laboratory apparatus is made of the __________ glass having low thermal co-efficient of expansion & high chemical resistance.

A. Flint
B. Soda
C. Pyrex
D. Potash

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Question 640

Sea water contains about __________ ppm of bromine.

A. 5
B. 70
C. 500
D. 1700

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Question 641

Blue vitriol is chemically

A. Copper sulphate
B. Ferrous sulphate
C. Copper nitrate
D. Aluminium sulphate

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Question 642

All enzymes are made of

A. fats
B. carbohydrates
C. proteins
D. amino acids

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Question 643

Which of the following, when pyrolysed, produces perchloro-ethylene?

A. Ethylene dichloride
B. Chlorobenzene
C. Carbon tetrachloride
D. Chlorinated paraffin

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Question 644

Finely ground calcium aluminate & silicate is a/an

A. Cermet
B. Cement
C. Abrasive
D. Explosive

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Question 645

Dacron is a/an

A. Polyester
B. Unsaturated polyster
C. Polyamide
D. Inorganic polymer

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Question 646

Flash point of most vegetable oils is about __________ °C.

A. 50
B. 100
C. 200
D. 300

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Question 647

Pasteurisation of milk means

A. Removal of fatty and albuminous substance from it
B. Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics
C. Inhibiting the growth of micro-organisms without killing them
D. None of these

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