# Stoichiometry MCQ Questions & Answers

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

Question 1

1 kgf/cm2 is not equal to

A. 1 torr
B. 1 bar
C. 10000 mm wc
D. 100 KPa = 100 000 N/m2

Question 2

6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H2 produced will be __________ gm.

A. 0.5
B. 1
C. 3
D. 5

Question 3

A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the

A. atomic weight of the metal is 4.
B. equivalent weight of the metal is 4.
C. atomic weight of the metal is 2.
D. equivalent weight of the metal is 8.

Question 4

A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)

A. 350
B. 485
C. 140
D. 345

Question 5

A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is

A. 2
B. 1
C. 0.5
D. 0.5

Question 6

A very dilute solution is prepared by dissolving 'x1' mole of solute in 'x2' mole of a solvent. The mole fraction of solute is approximately equal to

A. x1/x2
B. x2/x1
C. 1 - (x1/x2)
D. 1/x2

Question 7

An ideal gas can be liquified, because

A. its molecular size is very small.
B. its critical temperature is more than 0°C.
C. forces operative between its molecules are negligible.
D. it gets solidified directly without becoming liquid.

Question 8

Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm.

A. 1
B. 2
C. 3
D. 4

Question 9

At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be

A. 6
B. 8
C. 10
D. 12

Question 10

Atoms of the same element, but of different masses are called

A. isobars
B. isotones
C. isotopes
D. none of these

Question 11

Average molecular weight of air is about

A. 21
B. 29
C. 23
D. 79

Question 12

CaCO3 contains __________ percent of Ca by weight.

A. 40
B. 48
C. 96
D. 12

Question 13

Density of carbon dioxide is __________ kg/Nm3.

A. 44/22400
B. 44/22.4
C. 22.4/44
D. none of these

Question 14

Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is

A. 01-Sep
B. 08-Sep
C. 01-Feb
D. 05-Sep

Question 15

Gases diffuse faster compared to liquids because of the reason that the liquid molecules

A. are held together by stronger inter-molecular forces.
B. move faster.
C. have no definite shape.
D. are heavier

Question 16

Gases having same reduced temperatures and reduced pressures

A. deviate from ideal gas behaviour to the same degree.
B. have nearly the same compressibility factor.
C. both (a) and (b).
D. neither (a) nor (b).

Question 17

Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is

A. 10.73 kJ
B. 16.15 kJ
C. 18.11 kJ
D. 18.33 kJ

Question 18

Heat of solution in a system in which both solute and solvent are liquids is termed as

A. heat of solvation.
B. heat of hydration.
C. standard integral heat of solution.
D. heat of mixing.

Question 19

If pH value of a solution is 8, then its pOH value will be

A. 6
B. 1
C. 7
D. 10

Question 20

If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is __________ times.

A. 10
B. 100
C. 1000
D. 10000

Question 21

In case of a ternery system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the

A. solute concentration
B. temperature
C. both(a) & (b)
D. neither (a) nor (b)

Question 22

In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the

A. total pressure.
B. absolute humidity at a given temperature.
C. both (a) and (b).
D. neither (a) nor (b).

Question 23

Increasing the temperature of an aqueous solution will cause decrease in its

A. molality
B. mole fraction
C. weight percent
D. molarity

Question 24

Kopp's rule is concerned with the calculation of

A. thermal conductivity.
B. heat capacity.
C. viscosity.
D. surface tension.

Question 25

Molar heat capacity of water in equilibrium with ice at constant pressure is

A. 0
B. ∞
C. 1
D. none of these

Question 26

N2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample ? (molecular weight of urea = 60)

A. 80%
B. 90%
C. 95%
D. 98%

Question 27

On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes

A. 1
B. 8
C. 4
D. 2

Question 28

One micron is equal to

A. 10-4 mm
B. 10-4 cm
C. 10-6 m
D. both(b)&(c)

Question 29

One Newton is equal to __________ dynes.

A. 102
B. 103
C. 104
D. 105

Question 30

Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult's law is proportional to the

A. temperature.
B. volume of solution.
C. moles of non-volatile solute.
D. none of these.

Question 31

Pick out the wrong statement.

A. The effect of pressure on heat capacity of gases at pressure above one atmosphere and above the critical temperature is negligible.
B. The value of Cp of gases increases with increase in pressure, above atmospheric pressure.
C. The value of Cp at critical temperature and pressure reaches infinity.
D. all (a), (b), and (c).

Question 32

Pick out the wrong statement.

A. 'Reduced temperature' of a substance is the ratio of its existing temperature to its critical temperature, both expressed on celsius scale.
B. 'Reduced pressure' is the ratio of the existing pressure of a substance to its critical pressure.
C. 'Reduced volume' is the ratio of the existing molal volume of a substance to its critical molal volume.
D. none of these.

Question 33

Pick out the wrong statement.

A. Heat capacity of a diatomic gas is higher than that of a monoatomic gas.
B. Equal volumes of Argon and Krypton contain equal number of atoms.
C. Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 1023.
D. The binary mixture of a particular com-positidn in both vapor and liquid state is known as an azeotropic mixture

Question 34

Pick out the wrong unit conversion of calorific value.

A. 1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg.
B. 1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3.
C. 1 BTU/lb = 2.3 kcal/kg.
D. 1 kcal/m3 = 0.1124 BTU/ft3.

Question 35

S.T.P. corresponds to

A. 1 atm. absolute pressure & 15.5°C.
B. 760 mm Hg gauge pressure & 15.5°C.
C. 760 torr & 0°C.
D. 101.325 kPa gauge pressure & 15.5°C.

Question 36

Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the

A. same elevation in boiling point.
B. different elevation in boiling point.
C. elevation in boiling point in the ratio of their molecular weights.
D. none of these.

Question 37

Solutions which distil without change in composition are called

A. ideal
B. saturated
C. supersaturated
D. azeotropic

Question 38

Specific gravity on API scale is given by the relation(where, G = specific gravity at 15.5°C).

A. °API = 200(G - 1)
B. °API = (141.5/G) - 131.5
C. °API = (140/G) - 130
D. °API = 145 - (145/G)

Question 39

The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour

A. measures the elevation in boiling point.
B. is not dependent on the temperature.
C. is a function of the liquid phase composition.
D. measures the depression in freezing point.

Question 40

The chemical nature of an element is independent of

A. its atomic number.
B. the number of protons or electrons present in it.
C. the number of neutrons present in it.
D. none of these.

Question 41

The heat change for the reaction, C(s) + 2S(s) → CS2(l), is 104.2 kJ. It represents the heat of

A. formation
B. solution
C. combustion
D. fusion

Question 42

The rate of material __________ is zero in case of a steady state system.

A. accumulation
B. production
C. input
D. generation

Question 43

The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies

A. XM < 0.5
B. XM = 0.5
C. 0.5 < XM < 0.64
D. XM ≥ 0.64

Question 44

Vapor pressure of water at 100°C is about __________ bar.

A. 0.1013
B. 1.013
C. 10.13
D. 101.3

Question 45

Which of the following is an exothermic reaction ?

A. Conversion of graphite to diamond
B. Decomposition of water
C. Dehydrogenation of ethane to ethylene
D. none of these

Question 46

Which of the following is not a colligative property ?

A. Osmotic pressure
B. Depression of freezing point
C. Lowering of vapor pressure
D. none of these.

Question 47

Which of the following is not a unit of pressure ?

A. Torr
B. Newton/m2
C. Parsec
D. Ata, bar or pascal

Question 48

With rise in pressure, the solubility of gases in solvent, at a fixed temperature

A. increases
B. decreases
C. remains unchanged
D. decreases linearly

Question 49

20 grams of CaCO3 is heated, how much calcium oxide will produce?

A. 5.6 grams
B. 11.2 grams
C. 22.4 grams
D. 44.8 grams

Question 50

20 grams of NaOH is reacted with excess HCl, how much NaCl will it produce?

A. 29.25 grams
B. 58.5 grams
C. 117 grams
D. 234 grams

Question 51

1 mole of glucose is burnt, how much carbon dioxide will it produce?

A. 44 grams
B. 176 grams
C. 264 grams
D. 352 grams

Question 52

56 grams of carbon monoxide is oxidized with excess oxygen, how much carbon dioxide will it produce?

A. 22 grams
B. 44 grams
C. 66 grams
D. 88 grams

Question 53

60 grams of FeS2, is burnt in air, how much sulfur dioxide will produce?

A. 16 grams
B. 32 grams
C. 64 grams
D. 128 grams

Question 54

78 grams of benzene is burnt in air, how much water will it produce?

A. 18 grams
B. 36 grams
C. 54 grams
D. 72 grams

Question 55

158 grams of potassium permanganate is reacted with ferrous sulfide in the presence of hydrochloric acid, approximately how much ferric sulfate will it produce?

A. 111 grams
B. 169 grams
C. 254 grams
D. 399 grams

Question 56

C2H4 + xO2 -> 2CO2 + yH2O, what is the value of x + y?

A. 2
B. 3
C. 5
D. 8

Question 57

C5H12 + xO2 -> yCO2 + zH2O, what is the value of x + y*z?

A. 24
B. 38
C. 46
D. 54

Question 58

Pentane is burnt to produce carbon dioxide 40% of which can be converted into carbon monoxide, how much Butane must be burnt to produce 176 grams of carbon monoxide?

A. 18 grams
B. 36 grams
C. 72 grams
D. 96 grams

Question 59

wC3H6O3 + xO2 –> yCO2 + zH2O, what is the value of w + x + y + z?

A. 3
B. 6
C. 10
D. 14

Question 60

wC3H7O4 + xO2 -> yCO2 + zH2O, what is the value of w + x + y + z?

A. 21
B. 35
C. 41
D. 47

Question 61

Which of the following does stoichiometry of a reaction is all about?

A. Extent of reaction
B. Heat of reaction
C. Amount of reactants and products
D. None of the mentioned

Question 62

xFeS2 + yO2 -> zFe2O3 + wSO2, what is the value of x + y + z + w?

A. 16
B. 21
C. 25
D. 32

Question 63

xKMnO4 + yFeS + zH2SO4 -> xMnSO4 + wFe2(SO4)3 + uK2SO4 + zH2O, what is the value of x + y + z + w + u?

A. 60
B. 74
C. 85
D. 98

Question 64

By taking 360 gms of Glucose how many gms of CO2 can be produced?

A. 228
B. 328
C. 428
D. 528

Question 65

By taking 64 gms of O2, How many gms of H2O can be produced?

A. 18
B. 36
C. 54
D. 72

Question 66

1/A pound moles of CaSO4 are used to produce 222 kg of CaCl2. What is the value of A? Assume NaCl in excess.

A. 127
B. 227
C. 327
D. 427

Question 67

For producing 1 mole of CH3Cl, how many moles of Cl2 are required? (Consider CH4 in excess)

A. 1
B. 4
C. 5
D. 6.5

Question 68

For producing 1 mole of H2O, how many moles of NaOH are required? (Consider HCl in excess)

A. 1
B. 4
C. 5
D. 6.5

Question 69

For producing 1 mole of HCl, how many moles of CH4 are required? (Consider Cl2 in excess)

A. 1
B. 4
C. 5
D. 6.5

Question 70

For producing 1 mole of HCl, how many moles of Cl2 are required? (Consider CH4 in excess)

A. 1
B. 4
C. 5
D. 6.5

Question 71

For producing 1 mole of NaCl , how many moles of HCl are required? (Consider NaOH in excess)

A. 1
B. 4
C. 5
D. 6.5

Question 72

For producing 10 moles of H2O, how many moles of C4H10 are required? (Consider O2 is in excess)

A. 1
B. 2
C. 5
D. 10

Question 73

For producing 10 moles of H2O, how many moles of CH4 are required? (Consider O2 is in excess)

A. 1
B. 2
C. 5
D. 10

Question 74

For producing 34 gms of NH3, how many gms of H2 is required?

A. 3
B. 6
C. 9
D. 12

Question 75

For producing 36 gms of water in the reaction, how many moles of CH4 are required?

A. 1
B. 2
C. 3
D. 4

Question 76

For producing 4 gram moles of HNO3, how many grams of NO2 are required?

A. 274
B. 275
C. 276
D. 277

Question 77

For producing 6 mole of H2O, how many Kgs of Glucose is required?

A. 180
B. 360
C. 540
D. 720

Question 78

For producing 90 gms of water in the reaction, how many moles of C4H10 are required?

A. 1
B. 2
C. 3
D. 4

Question 79

For producing 90 gms of water in the reaction, how many moles of O2 are required?

A. 2.5
B. 4.5
C. 6.5
D. 8.5

Question 80

How many moles of H2O can be produced with 73 gms of HCl? (Consider NaOH in excess)

A. 1
B. 2
C. 3
D. None of the mentioned

Question 81

How many moles of HCl can be produced with 71 gms of Cl2? (Consider CH4 in excess)

A. 1
B. 2
C. 3
D. None of the mentioned

Question 82

How many moles of NaCl can be produced with 73 gms of HCl? (Consider NaOH in excess)

A. 1
B. 2
C. 3
D. None of the mentioned

Question 83

How many moles of O2 are required for producing 10 moles of H2O? (Consider C4H10 is in excess)

A. 6.5
B. 13
C. 15
D. 30

Question 84

How many moles of O2 are required for producing 10 moles of H2O? (Consider C4H10 is in excess)

A. 10
B. 20
C. 25
D. 30

Question 85

How many gms of CH3Cl can be produced with 16 gms of CH4? (Consider Cl2 in excess)

A. 50.5
B. 58.5
C. 60.5
D. None of the mentioned

Question 86

How many gms of H2O can be produced with 40 gms of NaOH? (Consider HCl in excess)

A. 18
B. 36
C. 54
D. None of the mentioned

Question 87

How many gms of HCl can be produced with 16 gms of CH4? (Consider Cl2 in excess)

A. 18.5
B. 36.5
C. 54.5
D. None of the mentioned

Question 88

How many gms of NaCl can be produced with 40 gms of NaOH? (Consider HCl in excess)

A. 50.8
B. 58.5
C. 60.2
D. None of the mentioned

Question 89

How many grams of C2H6 are required to produce 88 grams of CO2 when it is burned in the excess of oxygen?

A. 15
B. 30
C. 45
D. 60

Question 90

How many kg of Na2SO4 will be produced using 80 kg of NaCl? Assume CaSO4 in excess.

A. 122 kg
B. 142 kg
C. 162 kg
D. 182 kg

Question 91

How much CO2 in kg can be produced with 1 mole of C4H10? (Consider O2 is in excess)

A. 44
B. 88
C. 132
D. 176

Question 92

How much CO2 in kg can be produced with 1 mole of CH4? (Consider O2 is in excess)

A. 44
B. 88
C. 132
D. 176

Question 93

How much CO2 in kg can be produced with 1 mole of O2? (Consider C4H10 is in excess)

A. 26.07
B. 27.07
C. 28.08
D. 29.08

Question 94

How much CO2 in kg can be produced with 1 mole of O2? (Consider C4H10 is in excess)

A. 22
B. 88
C. 132
D. 176

Question 95

How many moles of CaCl2 will be produced using 300 kg of CaSO4? Assume NaCl in excess.

A. 2.2 kg
B. 4.2 kg
C. 6.2 kg
D. 8.2 kg

Question 96

How many moles of CH3Cl can be produced with 71 gms of Cl2? (Consider CH4 in excess)

A. 1
B. 2
C. 3
D. None of the mentioned

Question 97

If 1 kg of butane is burned with O2, then how much kg of CO2 will produce by 40 kg of butane?

A. 111.38
B. 121.38
C. 131.38
D. 141.38

Question 98

If 1 kg of Octane is oxidised with O2, then how much kg of O2 is required?

A. 200
B. 400
C. 600
D. 800

Question 99

If Cl2 is present in excess and the amount of CH4 is doubled, number of moles of CH3Cl will be ____________

A. Doubled
B. Half
C. Four times
D. None of the mentioned

Question 100

If Cl2 is present in excess and the amount of CH4 is doubled, number of moles of HCl will be ____________

A. Doubled
B. Half
C. Four times
D. None of the mentioned

Question 101

If HCl is present in excess and the amount of NaOH is doubled, number of moles of H2O will be ____________

A. Doubled
B. Half
C. Four times
D. None of the mentioned

Question 102

If HCl is present in excess and the amount of NaOH is doubled, number of moles of NaCl will be ____________

A. Doubled
B. Half
C. Four times
D. None of the mentioned

Question 103

If the amount of CO2 produced is 44 gms, then How many Kgs of Glucose was in the feed?

A. 30
B. 60
C. 90
D. 120

Question 104

If the NO2 in the feed is 400 gms, How many moles HNO3 will be in the product?

A. 2.797
B. 3.797
C. 4.797
D. 5.797

Question 105

If the required amount of water is 72 kg then how much C6H14 should be burned per hour?

A. 49.14
B. 39.14
C. 39.14
D. 29.14

Question 106

The law of _____________ states that chemical reactions proceed with fix ratios of the number of reactant and products and products involved in the reaction.

A. Mass Conservation
B. Mole Conservation
C. Constant Proportionality
D. None of the mentioned

Question 107

The value of b, is?

A. 1.5
B. 2.5
C. 3.5
D. 4.5

Question 108

The value of c, is?

A. 2
B. 4
C. 6
D. 8

Question 109

The value of d, is?

A. 1
B. 2
C. 3
D. 4

Question 110

What is the value of a+b+c+d?

A. 10
B. 12
C. 13
D. 14

Question 111

What is the value of b?

A. 1
B. 3
C. 5
D. 7

Question 112

What is the value of b?

A. 1
B. 3
C. 6
D. 9

Question 113

What is the value of b?

A. 1
B. 4
C. 5
D. 6.5

Question 114

What is the value of b?

A. 1
B. 2
C. 3
D. 4

Question 115

What is the value of c?

A. 2
B. 4
C. 6
D. 8

Question 116

What is the value of c?

A. 1
B. 2
C. 3
D. 4

Question 117

What is the value of c?

A. 1
B. 4
C. 5
D. 6.5

Question 118

What is the value of d?

A. 1
B. 2
C. 3
D. 4

Question 119

What is the value of d?

A. 1
B. 4
C. 5
D. 6.5

Question 120

What is the value of e?

A. 1
B. 3
C. 5
D. 7

Question 121

When 32gms of CH4 is burned with excess oxygen, how many grams of CO2 are produced?

A. 44
B. 88
C. 132
D. 176

Question 122

Internal energy is independent of the __________ for an ideal gas.

A. Pressure
B. Volume
C. Both A & B
D. Neither A nor B

Question 123

Viscosity of atmospheric air may be about __________ centipoise.

A. 0.015
B. 1.5
C. 15
D. 150

Question 124

Solutions having the same osmotic pressure are called __________ solutions.

A. Dilute
B. Ideal
C. Isotonic
D. Saturated

Question 125

In general, the specific heats of aqueous solutions __________ with increase in the concentration of the solute.

A. Increase
B. Decrease
C. Remain unchanged
D. None of these

Question 126

Pick out the wrong conversion formula for the conversion of weight units :

A. 1 tonne = 1000 kg = 22.046 lbs
B. 1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton
C. 1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons
D. None of these

Question 127

The amount of Zn (atomic weight = 65) required to form 224 c.c. of H₂ at N.T.P. on treatment with dilute H₂SO₄ will be __________ gm.

A. 0.065
B. 0.65
C. 6.5
D. 65

Question 128

Measurement of the amount of dry gas collected over water from volume of moist gas is based on the

A. Charle's law
B. Dalton's law of partial pressures
D. Boyle's law

Question 129

Pick out the wrong statement about the recycle stream in a process.

A. Recycling in a process stream helps in utilising the valuable reactants to the maximum with minimum loss of reactants
B. The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the quantity of the same reactant entering the process as fresh feed is called combined feed ratio
C. Recycling in a process does not help in getting higher extent of reaction
D. Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column

Question 130

In a chemical process, the recycle stream is purged for

A. Increasing the product yield
B. Enriching the product
C. Limiting the inerts
D. Heat conservation

Question 131

Osmotic pressure of the solution can be increased by

A. Decreasing its temperature
B. Increasing the volume of the vessel containing the solution
C. Diluting the solution
D. None of these

Question 132

The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the

A. Temperature & pressure
B. Number of intermediate chemical reactions involved
C. State of aggregation & the state of combination at the beginning & the end of the reaction
D. None of these

Question 133

Pick out the wrong statement.

A. To make 100 kg of a solution containing 40% salt by mixing solution A (containing 25% salt) and solution B (containing 50% salt), the amount of solution A required is 40 kg
B. 1.2 gm atoms of carbon and 1.5 gm moles of oxygen are reacted to give 1 gm mole of carbon dioxide. The limiting reactant is carbon. The percent excess reactant supplied is 25
C. A gas bubble at a pressure of Pg is passed through a solvent with a saturation vapour pressure of Ps. If the time of passage of the bubble is long and air is insoluble in the sol
D. A supersaturated solution of a sparingly soluble solute, at a concentration of C, is being fed to a crystalliser at a volumetric flow rate of V. The solubility .of the solute is C₁. The output rate

Question 134

The unit of dynamic viscosity is

A. Stoke
B. Poise
C. Gm/cm sec
D. Both B & C

Question 135

The heat capacity of a substance is

A. Greater for liquid state than for solid state
B. Lower for liquid state than for gaseous state
C. Higher for solid state than for liquid state
D. Equal for solid and liquid states below melting point

Question 136

A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is

A. 13728 J
B. 19206 J
C. 4576 J
D. 12712 J

Question 137

__________ kg of CaCO₃ on heating will give 56 kg of CaO.

A. 56
B. 100
C. 144
D. 1000

Question 138

The temperature at which real gases obey the ideal gas law over a wide range of pressure is called the __________ temperature.

A. Reduced
B. Boyle
C. Critical
D. Inversion

Question 139

The pH value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be

A. Basic
B. More acidic
C. Neutral
D. Of the same acidity

Question 140

Othmer chart is useful in estimating the heat of

A. Mixing
B. Wetting
D. None of these

Question 141

In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is

A. Independent of temperature
B. Increases with rise in pressure
C. Increased with decrease in pressure
D. Unchanged with pressure changes

Question 142

In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is

A. Independent of the temperature
B. Increased with the increase in pressure
C. Decreased with the increase in pressure
D. Unchanged by the pressure change

Question 143

What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20)?

A. AB₃
B. A₂B₃
C. A₂B
D. AB₂

Question 144

Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the 'corresponding states'. At equal reduced conditions i.e., at the corresponding state, the __________ of different gases are nearly the same.

A. Compressibility
B. Molecular weight
C. Humidity
D. None of these

Question 145

The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements. This is the statement of

A. Law of Petit and Dulong
B. Kopp's rule
C. Nearnst heat theorem
D. Trouton's rule

Question 146

In the reaction, represented by Na₂CO₃ + HC₁ → NaHO₃ + NaCl, the equivalent weight of Na₂CO₃ is

A. 53
B. 5.3
C. 106
D. 10.6

Question 147

Gases having same reduced temperatures and reduced pressures

A. Deviate from ideal gas behaviour to the same degree
B. Have nearly the same compressibility factor
C. Both A & B
D. Neither A nor B

Question 148

If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will

A. Be reduced to l/4th
B. Increase four times
C. Increase two times
D. None of these

Question 149

Disappearance of snow in subzero weather exemplifies the process of

A. Evaporation
B. Sublimation
C. Vaporisation
D. Melting

Question 150

At 100°C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100°C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150°C is 4.69 atm. At 150°C, the vapour pressure of methylcyclohexane would be expected to be

A. Significantly less than 4.69 atm
B. Nearly equal to 4.69 atm
C. Significantly more than 4.69 atm
D. Indeterminate due to lack of data

Question 151

If a solution of eutectic composition is cooled, __________ reaching the eutectic temperature.

A. The solvent begins to freeze out even before
B. It will undergo no change until
C. It will not solidify even on
D. None of these

Question 152

If 1.5 moles of oxygen combines with aluminium to form Al2O₃, then the weight of aluminium (atomic weight = 27 ) used in this reaction is __________ gm.

A. 27
B. 54
C. 5.4
D. 2.7

Question 153

Pick out the wrong statement.

A. Atomic heat capacities of the crystalline solid elements are nearly constant and equal to 6.2 kcal/kg-atom according to the law of Petit and Dulong
B. Atomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperature, when in the crystalline state
C. Generally, the heat capacities of compounds are lower in the liquid than in the solid state
D. The heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist

Question 154

Cox' chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the

A. Temperature vs. log (vapor pressure)
B. Vapor pressure vs. log (temperature)
C. Log (temperature) vs. log (vapor pressure)
D. Vapor pressure vs. temperature

Question 155

pH value of a solution containing 1 gm of hydrogen ion per litre will be

A. 0
B. 1
C. 7
D. 10

Question 156

Weight of 56 litres of ammonia at N.T.P. is __________ gm.

A. 2.5
B. 42.5
C. 56
D. 2800

Question 157

During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change.

A. Enthalpy
B. Gibbs free energy
C. Internal energy
D. Entropy

Question 158

Pick out the correct statement.

A. Heat of solution is always positive
B. At equilibrium, ΔG is zero
C. For the reaction, PCl5 ⇋ PCl3 + Cl₂, ΔG is less than ΔE
D. The heating of water in a beaker is an example of an isolated system

Question 159

Pick out the correct statement.

A. A substance existing above its critical temperature is called a saturated vapor
B. A mixture of vapor gas is called saturated, if the equilibrium vapor pressure of the liquid is more than the partial pressure of the vapor at the same temperature
C. Heat added to or given up by a substance at constant temperature is called the sensible heat
D. The end points of a vapor-pressure vs. temperature curve are critical and triple points

Question 160

Claussius Clapeyron equation applies to the __________ process.

A. Sublimation
B. Melting
C. Vaporisation
D. All of the above

Question 161

For a reacation, X → Y, if the concentration of 'X' is tripled; the rate becomes nine times. The order of reaction is

A. 0
B. 1
C. 2
D. 3

Question 162

Two solutions A₁ and A₂ have pH value of 2 and 6 respectively. It implies that the solution

A. A₁ is more alkaline than solution A₂
B. A₁ is highly acidic
C. A₁ is very slightly acidic
D. Both A & C

Question 163

A 'limiting reactant' is the one, which decides the __________ in the chemical reacation.

A. Equilibrium constant
B. Conversion
C. Rate constant
D. None of these

Question 164

The heat of vaporisation __________ with increase in pressure.

A. Increases
B. Decreases
C. Becomes zero at critical pressure
D. Both B and C

Question 165

Simultaneous doubling of the absolute temperature of a gas and reduction of its pressure to half, will result in __________ in the volume of the gas.

A. No change
B. Doubling
C. L/4th reduction
D. Four fold increase

Question 166

CaCO₃ contains __________ percent of Ca by weight.

A. 40
B. 48
C. 96
D. 12

Question 167

Cp equals Cv at

A. 0°C
B. 0°K
C. 0°F
D. 0°R

Question 168

Cp/Cv for monoatomic gases is

A. 1.44
B. 1.66
C. 1.99
D. 1

Question 169

Pick out the wrong statement.

A. The evaporation of aqueous solution of glucose causes its molarity to increase
B. Both the freezing point as well as boiling point of sea water is more than that of distilled water
C. The solution containing equal masses of two liquids 'X' and 'Y' has the same mole fraction of' 'X' and 'Y'
D. Both B and C

Question 170

Cp is expressed in S.I. unit as

A. J/kg.°K
B. 0°K
C. W/m². °C
D. W/m. °K

Question 171

The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 x __________

A. 1026
B. 1023
C. 1020
D. 1019

Question 172

1 ata is equivalent to

A. 1 atm
B. 10 torr
C. 0.98 Pascal
D. 1 kgf/cm²

Question 173

1 centipoise is equivalent to

A. 1 gm/cm.second
B. 1 centistoke
C. 2.42 lb/ft.hr
D. 2.42 lb/ft.second

Question 174

1 kg/cm² is equal to

A. 760 torr
B. 1KPa
C. 10 metres of water column
D. 1 metre of water column

Question 175

1 kgf/cm² is not equal to

A. 1 torr
B. 1 bar
C. 10000 mm wc
D. 100 KPa = 100 000 N/m²

Question 176

1 torr is equivalent to

A. 1 mm Hg
B. 1 Pascal
C. 1 ata
D. 1 mm wc

Question 177

Na₂SO₄. 10H₂O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na₂SO₄. The final concentration of the solute in the solution is 10%. The weight of crystals is

A. 20
B. 32.2
C. 45.35
D. 58.65

Question 178

Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m³ . The diffusivity of aniline in air is 0.74xl0-5m²/s.The numerical value of mass transfer co-efficient is 7.4 x 10-3. Its units are

A. M/s
B. Cm/s
C. Mole/m².s.Pa
D. Kmole/m².s.Pa

Question 179

1m³ is approximately equal to

A. 28 litres
B. 35 ft³
C. 4.5 litres
D. 4.5 ft³

Question 180

80 kg of Na₂SO₄ (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na₂SO₄ .10H₂O crystals separate out. The weight fraction of Na₂SO₄ in the remaining solution is

A. 0
B. 0.18
C. 0.24
D. 1

Question 181

Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because

A. The strong base and strong acid reacts completely
B. The salt formed does not hydrolyse
C. Only OH⁻ and H⁺ ions react in every case
D. The strong base and strong acid reacts in aqueous solution

Question 182

What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100°C, if their vapor pressures at 100°C are 1340, 560 and 210 mmHg respectively?

A. 756.2
B. 780.5
C. 801.5
D. 880.5

Question 183

A solution of specific gravity 1 consists of 35% A by weight and the remaining B. If the specific gravity of A is 0.7, the specific gravity of Bis

A. 1.25
B. 1.3
C. 1.35
D. 1.2

Question 184

Recycling in a chemical process facilitates

A. Increased yield
B. Enrichment of product
C. Heat conservation
D. All of the above

Question 185

With rise in temperature, the solubility of ammonia in water at a fixed pressure

A. Increases
B. Decreases
C. Remains unchanged
D. Increases exponentially

Question 186

A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of

A. 3
B. 100
C. 1000
D. None of these

Question 187

The density of a gas at N.T.P.is 'ρ'. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become ¾ 0.75ρ at a temperature of __________ °K

A. 273°
B. 300°
C. 400°
D. 300°

Question 188

An oxidation process is accompanied by decrease in the

A. Number of electrons
B. Oxidation number
C. Number of ions
D. All of the above

Question 189

1 torr is equal to __________ mm Hg column.

A. 1
B. 0.1
C. 10
D. 1000

Question 190

Viscosity of 1 centipoise is equal to 1 centis-toke in case of

A. Water
B. Mercury
C. Carbon tetrachloride
D. None of these

Question 191

Pick out the wrong statement.

A. One kg-mole of an ideal gas occupies 22.4 m³ at N.T.P
B. One lb-mole of an ideal gas occupies 359 ft³ at N.T.P
C. One gm-mole of an ideal gas occupies 22.4 litres (i.e., 22400 c.c) at N.T.P
D. Density of dry air at N.T.P. is 1 gm/litre

Question 192

Cv for monoatomic gases is equal to(where, R = gas constant)

A. R
B. 1.5 R
C. 2R
D. 3R

Question 193

The equilibria relations in a multicom-ponent and multiphase system can not be calculated with the help of the

A. Phase rule
B. Experimental data
C. Emperical equations
D. Theoretical equations

Question 194

A saturated vapor on being compressed would

A. Condense
B. Form wet steam
C. Both A & B
D. Neither A nor B

Question 195

One of the specific gravity scales is "Brix" (used speicifically for sugar solution). It is defined as

A. Brix = (400/G) - 400
B. Brix = 200 (G-1)
C. Brix = 145 - (145/G)
D. None of these

Question 196

Elements in a periodic table are arranged in order of their

A. Atomic number
B. Mass number
C. Atomic weight
D. Metallic characteristics

Question 197

For an ideal gas, the compressibility factor

A. Decreases with pressure rise
B. Is unity at all temperature
C. Is unity at Boyle's temperature
D. Zero

Question 198

The effect of pressure on the heat capacity of the gases __________ is negligible.

A. At pressure below one atmosphere
B. Below the critical temperature
C. Both A & B
D. Neither A nor B

Question 199

Gases diffuse faster compared to liquids because of the reason that the liquid molecules

A. Are held together by stronger inter-molecular forces
B. Move faster
C. Have no definite shape
D. Are heavier

Question 200

The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is

A. Termed as relative saturation
B. Not a function of the composition of gas mixture
C. Called percentage saturation
D. Not a function of the nature of vapor

Question 201

The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the

A. Nature of both the gas & the liquid
B. Temperature
C. Total pressure
D. None of these

Question 202

Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the

A. Nature of the liquid
B. Nature of the gas
C. Temperature of the liquid
D. Total pressure

Question 203

The heat capacity of most substances is greater for the __________ state.

A. Solid
B. Liquid
C. Gaseous
D. None of these

Question 204

Addition of a non-volatile solute to a pure solvent

A. Increases its freezing point
B. Increases its boiling point
C. Decreases its freezing point
D. Both B and C

Question 205

In the reaction, Ca + 2H₂O = Ca(OH)₂ + H₂ ; what volume (c.c.) of hydrogen at STP would be liberated, when 8 gm of calcium reacts with excess water? (atomic weight of calcium = 40)

A. 4480
B. 2240
C. 1120
D. 0.4

Question 206

Enthalpy of a vapor gas mixture may be increased by increasing the

A. Temperature at constant humidity
B. Humidity at constant temperature
C. Temperature and the humidity
D. All of the above

Question 207

In osmosis through a semi-permeable membrane, diffusion of the

A. Solvent is from low concentration to high concentration region
B. Solvent is from high concentration to low concentration region
C. Solute takes place
D. None of these

Question 208

Isotonic solutions must have the same

A. Viscosity
B. Molar concentration
C. Normality
D. Critical temperature

Question 209

The unit of Cp in S.I. units is

A. W/m².°K
B. J/kg.°K
C. W/m.°K
D. J/m³. °K

Question 210

Volume percent for gases is equal to the

A. Weight percent
B. Mole percent
C. Weight percent only for ideal gases
D. Mole percent only for ideal gases

Question 211

Kopp's rule is concerned with the calculation of

A. Thermal conductivity
B. Heat capacity
C. Viscosity
D. Surface tension

Question 212

Pick out the wrong statement.

A. Ten times dilution of a normal solution (N) reduces its normality to N/10
B. When equal weights of oxygen and methane are mixed in an empty reactor at room temperature, then the fraction of total pressure exerted by the oxygen is 1/2
C. Volume occupied by 9.034 x 1023 atoms of oxygen in ozone (O₃) at NTP will be 11200 c.c
D. One kg mole of an ideal gas at N.T.P occupies 22400 Nm³

Question 213

Pick out the correct conversion.

A. 1 BTU =453.6 calories
B. 1 BTU = 252 calories
C. 1 calorie = 252 BTU
D. 1 calorie = 453.6 BTU

Question 214

A reduction process is accompanied with increase in the

A. Number of electrons
B. Oxidation number
C. Both A & B
D. Neither A nor B

Question 215

In physical adsorption, as compared to chemisorption, the

A. Quantity adsorbed per unit mass is higher
B. Rate of adsorption is controlled by the resistance to surface reaction
C. Activation energy is very high
D. Heat of adsorption is very large

Question 216

Pick out the wrong unit conversion of calorific value.

A. 1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg
B. 1 BTU/ft³ = 8.9 kcal/m³ = 0.038 MJ/m³
C. 1 BTU/lb = 2.3 kcal/kg
D. 1 kcal/m³ = 0.1124 BTU/ft³

Question 217

What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C?

A. 2-3
B. 1-3
C. 1-2
D. L/3 x 298/273

Question 218

For any system, the __________ heat of solution is dependent on the temperature and the adsorbate concentration.

A. Integral
B. Differential
C. Both A & B
D. Neither A nor B

Question 219

For most salts, the solubility increases with rise in temperature, but the solubility of __________ is nearly independent of temperature rise.

A. Sodium chloride
B. Sodium carbonate monohydrate
C. Anhydrous sodium sulphate
D. Hypo

Question 220

Dry air is a mixture of

A. Vapors
B. Gases
C. Both A & B
D. Neither A nor B

Question 221

The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the

A. Relative humidity
B. Relative saturation
C. Percentage saturation
D. None of these

Question 222

A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)

A. 350
B. 485
C. 140
D. 345

Question 223

The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases.

A. Potential energy
B. Intermolecular forces
C. Kinetic energy
D. Total energy

Question 224

The total number of atoms in 8.5 gm of NH₃ is __________ x 1023.

A. 9.03
B. 3.01
C. 1.204
D. 6.02

Question 225

Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?

A. ΔH = 1 (+ ve)and Δ V = -ve
B. ΔH = 0
C. ΔV = 0
D. Both B and C

Question 226

Number of gm moles of solute dissolved in 1 kg of solvent is called its

A. Normality
B. Molarity
C. Molality
D. Formality

Question 227

Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the

A. Same elevation in boiling point
B. Different elevation in boiling point
C. Elevation in boiling point in the ratio of their molecular weights
D. None of these

Question 228

For estimation of heat capacity of a solid compound, one can use

A. Clayperon's equation
B. Gibb's equation
C. Kopp's rule
D. Trouton's rule

Question 229

Dissolving a solute in a solvent does not change its

A. Specific heat
B. Vapour pressure
C. Viscosity
D. None of these

Question 230

Pick out the wrong statement.

A. The effect of pressure on heat capacity of gases at pressure above one atmosphere and above the critical temperature is negligible
B. The value of Cp of gases increases with increase in pressure, above atmospheric pressure
C. The value of Cp at critical temperature and pressure reaches infinity
D. All of the above

Question 231

Heat of transition is the heat evolved or absorbed, when a substance is converted from

A. Vapor to liquid
B. Vapor to solid
C. Solid to liquid
D. One allotropic form to another allotropic form

Question 232

__________ fuels require the maximum percentage of 'excess air' for complete combustion.

A. Solid
B. Liquid
C. Gaseous
D. Nuclear

Question 233

Atomic __________ of an element is a whole number.

A. Weight
B. Number
C. Volume

Question 234

A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal

A. Kinetic energy
B. Intermolecular forces of attraction
C. Potential energy
D. Total energy

Question 235

The vapour pressure of water is given by, in Psat = A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50°C is approximately

A. 0.07
B. 0.09
C. 0.11
D. 0.13

Question 236

An equation for calculating vapour pressure is given by, log10 P = A - B(t + c). This is called the

A. Kistyakowsky equation
B. Antonic equation
C. Kopp's rule
D. Trouton's rule

Question 237

The combustion equations of carbon and carbon monoxide are as follows:C + O₂ = CO₂, ΔH = - 394 kJ/kg . mole CO + 1/2 O₂ = CO₂, ΔH = - 284.5 kJ/kg. mole. The heat of formation of CO is __________ kJ/kg. mole.

A. -109.5
B. 109.5
C. 180
D. 100

Question 238

In case of a ternery system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the

A. Solute concentration
B. Temperature
C. Both A & B
D. Neither A nor B

Question 239

Density of carbon dioxide is __________ kg/Nm³.

A. 44/22400
B. 44/22.4
C. 22.4/44
D. None of these

Question 240

Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of

A. Mixing
C. Wetting
D. Complete wetting

Question 241

The heat capacity of a solid compound is calculated from the atomic heat capacities of its constituent elements with the help of the

A. Trouton's rule
B. Kopp's rule
C. Antonie equation
D. Kistyakowsky equation

Question 242

Equal masses of CH₄ and H₂ are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is

A. 1-9
B. 8-9
C. 1-2
D. 5-9

Question 243

The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour

A. Measures the elevation in boiling point
B. Is not dependent on the temperature
C. Is a function of the liquid phase composition
D. Measures the depression in freezing point

Question 244

An ideal gas can be liquified, because

A. Its molecular size is very small
B. Its critical temperature is more than 0°C
C. Forces operative between its molecules are negligible
D. It gets solidified directly without becoming liquid

Question 245

The value of the gas-law constant 'R' is 1.987

A. Kcal/kg-mole.°C
B. Btu/lb-mole.°R
C. Kcal/kg-mole.°K
D. Both B & C

Question 246

Volume occupied by one gm mole of a gas at S.T.P. is

A. 22.4 litres
B. 22400 litres
C. 22.4 c.c
D. 359 litres

Question 247

The number of H⁺ in 1 c.c solution of pH 13 is

A. 6.023 xl0¹³
B. 6.023 x 10¹⁰
C. 6.023xl0⁷
D. 10¹³

Question 248

The density of a liquid is 1500 kg/m³. Its value in gin/litre will be equal to

A. 1.5
B. 15
C. 150
D. 1500

Question 249

One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ → CO₂ + 2H₂O. Both the reactants and products are in gas phase. ΔH°298 = - 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about

A. 0.19
B. 0.33
C. 0.4
D. 0.67

Question 250

The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies

A. 0 < Xw < 0.5
B. Xw = 0.5
C. 0.5 < Xw < 1.0
D. Xw = 1.0

Question 251

Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m³ . The diffusivity of aniline in air is 0.74xl0⁻⁵m²/s.The numerical value of mass transfer co-efficient is 7.4 x 10⁻³. The rate of evaporation of aniline is 2.97 x 10⁻⁴. Its units are

A. Mole/s
B. Mole/cm². s
C. Mole/m² . s
D. Kmole/m² . s

Question 252

A vapor whose partial pressure is less than its equilibrium vapor pressure is called a __________ vapor.

A. Saturated
B. Supersaturated
C. Superheated
D. None of these

Question 253

One Newton is equal to __________ dynes.

A. 10²
B. 10³
C. 10⁴
D. 10⁵

Question 254

Pick out the wrong statement.

A. Reduced temperature' of a substance is the ratio of its existing temperature to its critical temperature, both expressed on celsius scale
B. Reduced pressure' is the ratio of the existing pressure of a substance to its critical pressure
C. Reduced volume' is the ratio of the existing molal volume of a substance to its critical molal volume
D. None of these

Question 255

The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg.?

A. 0.2
B. 0.1
C. 0.4
D. 0.6

Question 256

The average value of heat of neutralisation of dilute solution of strong acids and strong bases is about __________ kcal/kg.mole of water formed.

A. 6680
B. 13360
C. 2481
D. 97302

Question 257

The heat change for the reaction, C(s) + 2S(s) → CS₂(l), is 104.2 kJ. It represents the heat of

A. Formation
B. Solution
C. Combustion
D. Fusion

Question 258

Which of the following is not used for computing latent heat of vaporisation?

A. Clausius-Clayperon equation
B. Reference substance plots based on Durhing & Othmer plots
D. Hess

Question 259

The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface. This statement pertaining to the solubility of gases in liquid is the __________ law.

A. Raoult's
B. Henry's
C. Amgat's
D. None of these

Question 260

2 litres of nitrogen at N.T.P. weighs __________ gms.

A. 14
B. 2.5
C. 28
D. 1.25

Question 261

Kinetic theory of gases stipulates that, the

A. Energy is lost during molecular collisions
B. Molecules possess appreciable volume
C. Absolute temperature is a measure of the kinetic energy of molecules
D. None of these

Question 262

At what temperature, given mass of a gas that occupies a volume of 2 litres at N.T.P. will occupy a volume of 4 litres, if the pressure of the gas is kept constant?

A. 273°C
B. 273°K
C. 100°C
D. 200°C

Question 263

40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is

A. 1-2
B. 1-3
C. 1-4
D. 2-3

Question 264

The vapor pressure of water at 100°C is

A. 100N/m²
B. 76 cms of Hg
C. 13.6 cms of Hg
D. 760 mm wc

Question 265

A bypass stream in a chemical process is useful, because it

A. Facilitates better control of the process
B. Improves the conversion
C. Increases the yield of products
D. None of these

Question 266

Which of the following ratios defines the recycle ratio in a chemical process?

A. Gross feed stream/recycle feed stream
B. Recycle stream/fresh feed stream
C. Recycle stream/gross feed stream
D. None of these

Question 267

Heat of reaction is a function of the

A. Pressure
B. Temperature
C. Both(a)&(b)
D. Neither (a) nor (b)

Question 268

Heat of reaction is not influenced by

A. The route/method through which final products are obtained
B. The physical state (e.g., solid, liquid or gaseous) of reactants and products
C. Whether the reaction is carried out at constant temperature or constant pressure
D. None of these

Question 269

Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules

A. Do not lose energy on collision
B. Are above the inversion temperature
C. Do not exert attractive force on each other
D. Do work equal to loss in kinetic energy

Question 270

Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature?

A. Chlorine
B. Nitrogen
C. Ethane
D. All of the above

Question 271

The OH⁻ concentration in a solution having pH value 3 is

A. 10-3
B. 10-10
C. 10-11
D. 10-13

Question 272

The viscosity of water at room temperature may be around one

A. Centipoise
B. Poise
C. Stoke
D. Both B & C

Question 273

A vapor that exists above its critical temperature is termed as a __________ vapor.

A. Saturated
B. Unsaturated
C. Gaseous
D. Sub-cooled

Question 274

A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be

A. 0°C
B. 0°K
C. -136.5°C
D. -136.5°K

Question 275

A gas at 0°C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be

A. -136.5°C
B. - 136.5°K
C. -273°C
D. 0°K

Question 276

Which of the following is not a unit of kinematic viscosity?

A. Poise
B. Stoke
C. Cm²/second
D. None of these

Question 277

Pick out the wrong statement.

A. Heat capacity of a diatomic gas is higher than that of a monoatomic gas
B. Equal volumes of Argon and Krypton contain equal number of atoms
C. Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 1023
D. The binary mixture of a particular com-positidn in both vapor and liquid state is known as an azeotropic mixture

Question 278

Ideal solution is formed, when its components have zero

A. Heat of mixing
B. Volume change
C. Both A & B
D. Neither A nor B

Question 279

The heat evolved in the combustion of benzene is represented by the equation: C₆H₆ + 7.5 O₂ = 6CO₂ + 3H₂O, ΔH = 3264.6 kJ/kg. mole The heat energy change, when 39 gm of C₆H₆ is burnt in an open container, will be __________ kJ/kgmole.

A. 816.15
B. 1632.3
C. -1632.3
D. -2448.45

Question 280

If the pH value of a solution changes by one unit, it implies that hydrogen ion concentration in the solution will change __________ times.

A. 10
B. 20
C. 70
D. 100

Question 281

The atomic heat capacities of all solid elements __________ with decrease in temperature.

A. Increases
B. Decreases
C. Remains unchanged
D. Approach zero at 0°C

Question 282

At higher temperature, molal heat capacities of most of the gases (at constant pressure) __________ with increase in temperature.

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

Question 283

At higher temperatures, molal heat capacities for most of the gases (at constant pressure) __________ with increase in temperature.

A. Varies linearly
B. Increases
C. Decreases
D. Does not vary

Question 284

Assuming that CO₂ obeys perfect gas law, calculate the density of CO₂ (in kg/m³) at 263°C and 2 atm.

A. 1
B. 2
C. 3
D. 4

Question 285

1 Pascal (unit of pressure) is equal to __________ N/m².

A. 10
B. 1
C. 0.1
D. 1000

Question 286

The unit of specific heat at constant pressure, Cp, in SI unit is

A. W/m²°C
B. J/kg°K
C. W/m°K
D. J/m³°K

Question 287

Cp - Cv, for an ideal gas is equal to

A. R
B. R/2
C. 2R
D. 3R

Question 288

With increase in temperature, the surface tension of water

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

Question 289

The temperature of a gas in a closed container is 27° C. If the temperature of the gas is incresed to 300° C, then the pressure exerted is

A. Doubled
B. Halved
C. Trebled
D. Unpredictable

Question 290

In a neutral solution

A. H⁺ ions are absent
B. OH⁻ ions are absent
C. Both H⁺ and OH⁻ ions are present in very small but equal concentration
D. None of these

Question 291

A vessel of volume 1000 m³ contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately

A. 17
B. 20
C. 25
D. 34

Question 292

In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest?

A. 30 c.c acid and 30 c.c base
B. 20 c.c acid and 25 c.c base
C. 15 c.c acid and 35 c.c base
D. 35 c.c acid and 15 c.c base

Question 293

In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the

A. Total pressure
B. Absolute humidity at a given temperature
C. Both A & B
D. Neither A nor B

Question 294

Which of the following is not a unit of pressure?

A. Parsec
B. Kilo-pascal
C. Bar
D. Newton/metre²

Question 295

NaOH contains __________ percent oxygen.

A. 1
B. 10
C. 16
D. 40

Question 296

The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is __________ kg mole.

A. 1
B. 0
C. 16
D. 44

Question 297

The value of gas constant 'R' is __________ kcal/kg.mole.°C.

A. 2.79
B. 1.987
C. 3.99
D. None of these

Question 298

Heat of __________ of a fuel is called its calorific value.

A. Formation
B. Combustion
C. Reaction
D. Vaporisation

Question 299

The average translational kinetic energy with which a gas molecule is endowed is dependent on its

A. Nature
B. Size
C. Absolute temperature
D. All of the above

Question 300

Concentration of a solution expressed in terms of __________ is independent of temperature.

A. Molarity
B. Normality
C. Molality
D. None of these

Question 301

Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the

A. Recycling
B. Purging
C. Bypassing
D. Recirculation

Question 302

Which of the following gases is the most soluble in water?

A. NH₃
B. CO₂
C. H₂S
D. CH₄

Question 303

Pick out the wrong statement:

A. Clausius-Clapeyron equation relates the latent heat of vaporisation to the slope of the vapor pressure curve
B. At the boiling point of liquid at the prevailing total pressure, saturated absolute humidity is infinite
C. Percentage saturation and relative saturation are numerically equal for an unsaturated vapor gas mixture
D. Clapeyron equation is given by,dP/dT = λ/T(VG - VL); where, P = vapor pressure, T = absolute temperature, λ = latent heat of vaporisation, VG and VL = vol

Question 304

Internal energy of a substance comprises of the __________ energy.

A. Vibrational
B. Rotational
C. Translational
D. All of the above

Question 305

At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to

A. Decrease in mean free path
B. Increased collision rate among molecules
C. Increase in molecular attraction
D. Increase in average molecular speed

Question 306

Which of the following is insensitive to changes in pressure?

A. Heat of vaporisation
B. Melting point
C. Heat of fusion
D. Both B & C

Question 307

Number of gram equivalent of solute dissolved in one litre of solution is called its

A. Normally
B. Molarity
C. Molality
D. Formality

Question 308

1 kg of calcium carbide (CaC₂) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour?

A. 5
B. 10
C. 15
D. 20

Question 309

Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent?

A. Temperature
B. Nature of solute
C. Pressure
D. Nature of solvent

Question 310

Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is

A. 80.1°C
B. Less than 80.1°C
C. 100°C
D. Greater than 80.1°C but less than 100°C

Question 311

Applicability of Claussius-Clapeyron equation is subject to the condition that the

A. Vapor follows ideal gas law
B. Volume in the liquid state is negligible
C. Both A & B
D. Neither A nor B

Question 312

A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the

A. Atomic weight of the metal is 4
B. Equivalent weight of the metal is 4
C. Atomic weight of the metal is 2
D. Equivalent weight of the metal is 8

Question 313

The heats of vaporisation of CS₂, C₂H₅OH &H₂O are 26.8, 38.6 & 40.6 KJ/kg mole respectively. The order of decreasing inter-molecular forces in these liquids is

A. H₂O > C₂H₅OH > CS₂
B. CS₂ > C₂H₅OH > H₂O
C. H₂O > CS₂ > C₂H₅OH
D. CS₂ > H₂O > C₂H₅OH

Question 314

The heat of adsorption of a gas caused by Van der Walls forces of attraction and capillarity is equal to the heat of

A. Normal condensation
B. Wetting
C. Sum of A and B
D. Difference of A and B

Question 315

__________ equation relates latent heat and boiling point.

A. Antonie
B. Kistyakowsky
C. Kopp's
D. Trouton's

Question 316

If 1 Nm³ of O₂ contains 'N' number of molecules, then number of molecules in 2Nm³ of SO₂ will be

A. N
B. N/2
C. 2N
D. 4N

Question 317

1 Kcal/kg. °C is equivalent to __________ BTU/lb. °F.

A. 1
B. 2.42
C. 4.97
D. None of these

Question 318

1 BTU/lb.°F is equivalent to __________ kcal/kg.°C.

A. 1
B. 2.42
C. 1.987
D. 4.97

Question 319

A solution with reasonably permanent pH is called a/an __________ solution.

A. Ideal
B. Non-ideal
C. Buffer
D. Colloidal

Question 320

A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct?

A. Xc > Xs
B. Xc = Xs
C. Xc < Xs
D. Xc greater/less than Xs depending on the length of the cylinder

Question 321

pH value of an alkaline solution is

A. 7
B. > 7
C. < 7
D. Constant over a wide range

Question 322

Heat of solution in a system in which both solute and solvent are liquids is termed as

A. Heat of solvation
B. Heat of hydration
C. Standard integral heat of solution
D. Heat of mixing

Question 323

Mass number of an atom is the sum of the numbers of

A. Neutrons and protons
B. Protons and electrons
C. Neutrons and electrons
D. Both A & B

Question 324

At standard conditions, N₂ + 2O₂ ⇋ 2NO₂; ΔG° = 100 kJ/moleNO + ½O₂ ⇋ 2NO₂; ΔG° = -35 kJ/moleThe standard free energy of formation of NO in kJ/mole is

A. 15
B. 30
C. 85
D. 170

Question 325

Pick out the wrong statement:

A. The integral heat of solution of either components can not be calculated from heat of mixing data
B. The average value of heat of neutralisation of dilute solutions of weak acids and bases is much less compared to that for strong acids and bases
C. The standard heat of solution of the hydrate of a substance is the difference between the heat of solution of the anhydrous substance and its heat of hydration
D. The accompanying enthalpy change, when a solute is dissolved in solvent, depends upon the nature & amount of the solute & the solvent, on the temperature & on the initial & final conce

Question 326

The maximum adiabatic flame temperature of fuels in air is __________ the maximum flame temperature in pure oxygen.

A. Lower than
B. Higher than
C. Same as
D. Not related to

Question 327

1 gm mole of methane (CH₄) contains

A. 6.02 x 1023 atoms of hydrogen
B. 4 gm atoms of hydrogen
C. 3.01 x 1023 molecules of methane
D. 3 gms of carbon

Question 328

N₂ content in a urea sample was found to be only 42%. What is the actual urea content of the sample ? (molecular weight of urea = 60)

A. 80%
B. 90%
C. 95%
D. 98%

Question 329

Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is

A. 1.72
B. 0.58
C. 0.5
D. 0.2

Question 330

__________ equation gives the effect of temperature on heat of reaction.

A. Kirchoffs
B. Maxwell's
C. Antonie
D. Kistyakowsky

Question 331

For the gaseous phase reaction, N₂ + O₂ ⇋ 2NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by

A. Increasing the concentration of N₂
B. Decrease in temperature
C. Increase in pressure
D. Decrease in pressure

Question 332

The most convenient way of expressing solution concentration is in terms of

A. Mole fraction
B. Normality
C. Molality
D. Molarity

Question 333

For a given mass of a gas at constant temperature, if the volume 'V' becomes three times, then the pressure 'P' will become

A. P/3
B. 3P
C. 9P²
D. 9P

Question 334

For an ideal solution, the total vapor pressure varies __________ with the composition(expressed as mole fraction).

A. Inversely
B. Exponentially
C. Linearly
D. Negligibly

Question 335

N.T.P. corresponds to

A. 1 atm.absolute pressure& 0°C
B. 760 mm Hg gauge pressure & 0°C
C. 760 torr & 15°C
D. 101.325 KPa gauge pressure & 0°C

Question 336

Which of the following is an exothermic reaction?

A. Conversion of graphite to diamond
B. Decomposition of water
C. Dehydrogenation of ethane to ethylene
D. None of these

Question 337

Which of the following is not a unit of pressure?

A. Torr
B. Newton/m²
C. Parsec
D. Ata, bar or pascal

Question 338

Pick out the wrong unit conversion of temperature.

A. °R = 273 + °F
B. Temperature difference of 1°K = 1°C = 9/5 °F
C. °C = (F- 32) x 0.555
D. °F = (°C + 17.778) x 1.8

Question 339

On mixing 56 gm of CaO with 63 gm of HNO₃, the amount of Ca(NO₃)₂ formed is __________ gm.

A. 82
B. 164
C. 41
D. 8.2

Question 340

Degrees of freedom will be equal to the number of components for a system comprising of

A. Only soluble liquid components
B. Partially miscible two liquid components system having two phases
C. Two liquid components and one solute (soluble in both the liquids)
D. None of these

Question 341

Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are PvB and Pvw respectively. The partial pressure of benzene in air-vapour mixture is

A. PvB
B. XB.PvB
C. (Patm - Pvw)xB
D. XB.Patm

Question 342

According to the kinetic theory, the thermal conductivity of a monoatomic gas is proportional to

A. T
B. T0.5
C. T1.5
D. T2

Question 343

How much O₂ can be obtained from 90 kg of water?

A. 32 kg
B. 80 kg
C. 64 kg
D. 90 kg

Question 344

Which of the following has the smallest least effect on the solubility of a solute into the solvent?

A. Nature of the solute
B. Nature of the solvent
C. Temperature
D. Pressure

Question 345

pH value of H₂SO₄ (5% concentration) is

A. 5
B. 7
C. > 7
D. < 7

Question 346

Pick out the wrong unit conversion of heat transfer co-efficient.

A. 1 kcal/m².hr.°C = 0.2048 BTU/ft².hr. °F. = 1.163 W/m².°K
B. 1 kcal/m².hr.°K = 1.163 W/m².°C
C. 1 W/m² . °C = 0.1761 BTU/ft².hr.°F
D. 1 BTU/ft².hr.°F = 4.88 kcal/m².hr.°C = 20.44 kJ/m².hr°C = 5.678 W/m².°C

Question 347

Pick out the wrong unit conversion of mass transfer co-efficient.

A. 1 lb/hr.ft³.atm. = 4.8182 kg/hr.m².bar
B. 1 kg/hr.m².atm= 0.98687 kg/hr. m .bar
C. 1 lb/hr . ft² = 4.8823 kg/hr . m²
D. 1 kg/hr . m² = 4.8823 lb/hr . ft²

Question 348

With increase in the temperature of pure (distilled) water, its

A. POH decreases and pH increases
B. POH and pH both 4ecreases
C. PH and pOH both increases
D. PH decreases and pOH increases

Question 349

As per Kirchoff s equation, the heat of reaction is affected by the

A. Pressure
B. Volume
C. Temperature
D. Molecularity

Question 350

Size range of the colloidals particles is

A. 5 - 200 milli-microns
B. 50 - 200 microns
C. 500 - 1000 microns
D. 10 - 50 Angstrom

Question 351

In a binary liquid system, the composition expressed as __________ is independent of the temperature & pressure.

A. Kg of solute/kg of solvent
B. Kg-mole of solute/kg-mole of solvent
C. Kg-mole of solute/1000 kg of solvent
D. All of the above

Question 352

The atomic weight of helium is 4 times that of hydrogen. Its diffusion rate as compared to hydrogen will be __________ times.

A. 1-2
B. 4
C. √2
D. 1-4

Question 353

Which of the following is followed by an ideal solution ?

A. Boyle's law
B. Amgat's law
C. Raoult's law
D. Trouton's rule

Question 354

According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.

A. No component is concentrated at the surface of the solution
B. The component molecules are non polar and are of almost equal size
C. In the formation of solution, chemical combination/molecular association between unlike molecules takes place
D. The attractive forces between like and unlike molecules are almost equal

Question 355

Real gases approach ideal behaviour at

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

Question 356

Avogadro number is the number of molecules in one __________ of a gas.

A. Gram
B. Kilogram
C. Gm.mole
D. Litre

Question 357

The number of atoms of oxygen present in 11.2 litres of ozone (O₃) at N.T.P. are

A. 3.01 x 10²²
B. 6.02 x 10²³
C. 9.03 x 10²⁴
D. 1.20 x 10²⁴

Question 358

The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. The temperature at which the above mixture will exert a pressure of one standard atm. is

A. Less than 100°C
B. 100°C
C. Between 100 and 110°C
D. 110.6°C

Question 359

Roult's law is obeyed by a __________ solution.

A. Saturated
B. Molar
C. Normal
D. None of these

Question 360

The quantity of heat required to evaporate 1 kg of a saturated liquid is called

A. Specific heat
B. 1 Kcal
C. Sensible heat
D. Latent heat

Question 361

Pick out the wrong statement.

A. Raoult
B. Molecules with symmetrical arrangement (e.g., CH₄ and CCl₄) are non-polar
C. Most of the hydrocarbons are nonpolar
D. Generally, nonpolar compounds are chemically inactive, conduct electricity poorly and do not ionise

Question 362

A car tyre of volume 0.057 m³ is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is

A. 380
B. 630
C. 760
D. 880

Question 363

The chemical nature of an element is independent of

A. Its atomic number
B. The number of protons or electrons present in it
C. The number of neutrons present in it
D. None of these

Question 364

The osmotic pressure of a solution increases, if its __________ is decreased.

A. Volume
B. Solute concentration
C. Temperature
D. None of these

Question 365

Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity?Vapour pressure of water at 20°C is 17.5 mm Hg.

A. 80.38
B. 80
C. 79.62
D. 78.51

Question 366

Validity of the relationship, inputs = outputs, holds good for the system at steady state

A. With chemical reaction
B. Without chemical reaction
C. Without chemical reaction & losses
D. None of these

Question 367

The crystallisation of a solute from a solution may be done by

A. Removal of pure solvent by evaporation
B. Change of temperature thereby causing supersaturation
C. Changing the nature of the system by the addition of a more soluble material
D. All of the above

Question 368

Giga' stands for

A. 109
B. 10-12
C. 1012
D. 1015

Question 369

The vapor pressure of liquids (having similar chemical nature) at any specified temperature __________ with increasing molecular weight.

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

Question 370

__________ chart is a graph related to Antonie equation.

A. Ostwald
B. Cox
C. Mollier's
D. Enthalpy-concentration

Question 371

Sodium __________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature.

A. Carbonate (monohydrate)
B. Chloride
C. Thiosulphate
D. Bisulphite

Question 372

Normality of a solution does not change with the increase in the

A. Pressure
B. Temperature
C. Solute concentration
D. Dilution of the solution

Question 373

The elevation in boiling point of a solution is proportional to the __________ of the solution.

A. Molal concentration
B. Reciprocal of the molal concentration
C. Normality
D. Molarity

Question 374

A gas occupies a volume of 283 c.c at 10°C. If it is heated to 20°C at constant pressure, the new volume of the gas will be __________ c.c.

A. 283
B. 566
C. 293
D. 141.5

Question 375

The latent heat of vaporisation

A. Decreases with increased temperature
B. Decreases as pressure increases
C. Becomes zero at the critical point
D. All of the above

Question 376

If the partial pressure of the solvent in the vapor phase is equal to the vapor pressure of the solvent at that temperature, then the system is said to be at its

A. Bubble point
B. Saturation temperature
C. Dew point
D. Both B and C

Question 377

The molecular velocity of a real gas is proportional to (where, T = absolute temperature of the gas).

A. √T
B. T
C. T²
D. 1/√T

Question 378

Total energy at a point comprises of __________ energy.

A. Potential & kinetic
B. Pressure
C. Internal
D. All of the above

Question 379

The reverse process of fractional crystallisation is called

A. Stripping
B. Leaching
C. Differential distillation
D. Absorption

Question 380

One micron is equal to

A. 10⁻⁴ mm
B. 10⁻⁴ cm
C. 10⁻⁶ m
D. Both B & C

Question 381

One 'Therm' is equivalent to

A. 10⁵ BTU
B. 10⁵ kcal
C. 10⁹ BTU
D. 10⁹ kcal

Question 382

Refluxing of part of the distillate in a fractionating column is a 'recycling operation', aimed primarily at

A. Heat conservation
B. Yield enhancement
C. Product enrichment
D. None of these

Question 383

Isotopes are atoms having the same

A. Mass number
B. Number of neutrons
C. Atomic mass
D. None of these

Question 384

One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ → CO₂ + 2H₂O. Both the reactants and products are in gas phase. ΔH°298 = - 730 kJ/mole of methane. If the average specific heat of all the gases/vapour is 40 J/mole.K, the maximum temperature rise of the exhaust gases in °C would be approximately equal to

A. 1225
B. 1335
C. 1525
D. 1735

Question 385

Pick out the wrong unit conversion.

A. 1 atm. = 760 mm Hg = 29.92 inch Hg = 14.7 psi = 1.013 bar = 1.013 kgf/cm²
B. 1 kPa = 100 bar
C. 1 mm Hg = 1 torr = 133.3 Pa
D. None of the above

Question 386

Pick out the wrong unit conversion.

A. L kgf= 9.8 Newton
B. 1 stoke = 1 m²/second
C. 1 Pascal second = 10 poise
D. 1 ppm = 1 ml/m³ = 1 mg/kg

Question 387

Pick out the wrong unit conversion.

A. 1 Joule = 4.186 calorie
B. 1 kcal = 3.968 BTU = 0.00116 kWh = 0.00156 hp
C. 1 ton of TNT (tri-nitro-toluene) = 4.2 GJ (1G = 10⁹)
D. 1 ft.lbf= 0.3238 calorie = 0.1383 kg.m = 1.356 J = 1.356 N.m

Question 388

pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be

A. 0
B. 10
C. 7
D. 14

Question 389

No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules

A. Collide without loss of energy
B. Do work equal to loss in kinetic energy
C. Are above the inversion temperature
D. Exert no attractive force on each other

Question 390

In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?

A. Use of equation of state
B. Fugacity co-efficient
C. Activity co-efficient
D. None of these

Question 391

Pick out the wrong statement:

A. A vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure
B. A vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a 'superheated vapor'
C. The temperature at which a vapor is saturated is termed as the boiling point
D. The difference between the existing temperature of a vapor and its saturation temperature (i.e. dew point) is called its 'degree of superheat'

Question 392

Which of the following ideal gas laws are not applicable to mixture of gases ?

A. Amgat's law
B. Dalton's law
C. Boyle's law & Charle's Law
D. None of these

Question 393

Atmospheric pressure corresponds to a hydrostatic head of

A. 13.6 cms of Hg
B. 34 ft ofH₂O
C. 1 metre of H₂O
D. 13.6 metres of Hg

Question 394

Compressibility factor of a real gas is the ratio of the actual volume to that predicted by ideal gas law. As the pressure of the gas approaches zero, the compressibility factor approaches

A. ∞
B. 0
C. 1
D. 0.24

Question 395

In __________ process, ions of salts react with water to produce acidity or alkalinity.

A. Hydration
B. Hydrolysis
C. Electrolysis
D. Dialysis

Question 396

1 bar is almost equal to __________ atmosphere.

A. 1
B. 10
C. 100
D. 1000

Question 397

Which of the following expressions defines the Baume gravity scale for liquids heavier than water?

A. (141.5/G) - 131.5
B. 145 - (145/G)
C. 200(G-1)
D. (400/G) - 400

Question 398

Which of the following gravity scales is used exclusively for liquids heavier than water?

A. Baumme scale
C. API scale
D. None of these

Question 399

Which of the following expressions defines the Baume gravity scale for liquids lighter than water?

A. °Be = (140/G) - 130
B. °Be = 200(G-1)
C. °Be = 145 - (145/G)
D. °Be = (400/G) - 400

Question 400

An azeotropic solution of two liquids has boiling point lower than either of them, when it

A. Is saturated
B. Is unsaturated
C. Shows negative deviation from Raoult's law
D. Shows positive deviation from Raoult's law

Question 401

A chemical process is said to occur under unsteady state, if the

A. Inventory changes do not take place
B. Ratio of streams entering/leaving are independent of time
C. Flow rates & composition both are time dependent
D. None of these

Question 402

In a binary liquid solution of components A and B, if component A exhibits positive deviation from Raoult's law, then component B

A. Exhibits positive deviation from Raoult's law
B. Exhibits negative deviation from Raoult's law
C. Obeys Raoult's law
D. May exhibit either positive or negative deviation from Raoult's law

Question 403

Number of gm moles of solute dissolved in one litre of a solution is called its

A. Equivalent weight
B. Molarity
C. Molality
D. Normality

Question 404

A perfectly insulated container of volume V is divided into two equal halves by a partition. One side is under vacuum, while the other side has one mole of an ideal gas (with constant heat capacity) at 298 K. If the partition is broken, the final temperature of the gas in the container

A. Will be greater than 298 K
B. Will be 298 K
C. Will be less than 298 K
D. Can not be determined

Question 405

How many phases are present at eutectic point?

A. 1
B. 2
C. 3
D. Unpredictable

Question 406

The pressure of 'V' litres of a dry gas is increased from 1 to 2 kgf/cm² at a constant temperature. The new volume will become

A. V/2
B. 2V
C. V/4
D. V²

Question 407

The temperature at which the second Virial co-efficient of a real gas is zero is called the

A. Eutectic point
B. Boyle temperature
C. Boiling point
D. Critical temperature

Question 408

The depression in freezing point of a solution is

A. Inversely proportional to the mass of solvent
B. Directly proportional to the mole of solute
C. Both A & B
D. Neither A nor B

Question 409

In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is

A. 180
B. 60.3
C. 720
D. 200

Question 410

Saturated molal absolute humidity of the vapor-gas mixture depends upon the

A. Vapor pressure at dry bulb temperature
B. Total pressure
C. Both A & B
D. Neither A nor B

Question 411

6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H₂ produced will be __________ gm. gm.

A. 0.5
B. 1
C. 3
D. 5

Question 412

One micron is equal to __________ cm.

A. 10-2
B. 10-4
C. 10-6
D. 10-8

Question 413

Pick out the wrong unit conversion of thermal conductivity.

A. 1 BTU/ft².hr.°F/ft = 1.488 kcal/m². hr.°C/m
B. 1 BTU/ft².hr.°F/inch = 1.488 kcal/m². hr.°C/m
C. 1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K
D. 1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F

Question 414

Kopp's rule is helpful in finding the

A. Heat capacities of solids
B. Heat capacities of gases
C. Molal heat capacities of gases
D. Activation energy

Question 415

Hess's law of constant heat summation is based on conservation of mass. It deals with

A. Equilibrium constant
B. Reaction rate
C. Changes in heat of reaction
D. None of these

Question 416

Except for monoatomic gases, the molal heat capacity at constant volume for all gases is __________ Kcal/Kg mole.° K.

A. 3
B. > 3
C. < 3
D. < 1

Question 417

Addition of a non-volatile solute to a solvent produces a __________ in its solvent.

A. Freezing point elevation
B. Boiling point depression
C. Vapor pressure lowering
D. All of the above

Question 418

The temperature at which a real gas obeys Boyle's law is termed as the

A. Triple point
B. Boyle's temperature
C. Eutectic point
D. Inversion temperature

Question 419

A vapor whose partial pressure is less than its equilibrium vapor pressure is called the __________ vapor.

A. Saturated
B. Superheated
C. Unsaturated
D. Dry gaseous

Question 420

The osmotic pressure of a solution is directly proportional to the

A. Lowering of vapor pressure
B. Molecular concentration of the solute
C. Absolute temperature of a given concentration
D. All of the above

Question 421

At a temperature of 0°K, the molecules of a gas have only __________ energy.

A. Rotational
B. Vibrational
C. Translational
D. None of these

Question 422

Raoult's law is not applicable to the

A. Solutes which dissociate or associate in the particular solution
B. Concentrated solutions
C. Both B & C
D. Solutions containing non-volatile solute

Question 423

Which of the following is not a colligative property?

A. Osmotic pressure
B. Depression of freezing point
C. Lowering of vapor pressure
D. None of these

Question 424

The value of Trouton's ratio (λb/Tb) for a number of substances is 21 (where, λb = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, °K). The Kis-tyakowsky equation is used for calculation of Trouton's ratio of __________ liquids.

A. Polar
B. Non-polar
C. Both A & B
D. Neither A nor B

Question 425

The total volume occupied by a gaseous mixture is equal to the sum of the pure component volumes. This is the __________ law.

A. Dalton's
B. Amgat's
C. GayLussac's

Question 426

S.T.P. corresponds to

A. 1 atm. absolute pressure & 15.5°C
B. 760 mm Hg gauge pressure & 15.5°C
C. 760 torr & 0°C
D. 101.325 kPa gauge pressure & 15.5°C

Question 427

The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vapourised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is

A. 0.4
B. 0.6
C. 0.8
D. 0.2

Question 428

Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the

A. Sizes of the component molecules are approximately equal
B. Attractive forces between like and unlike molecules are approximately equal
C. Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution
D. All of the above

Question 429

Kopp's rule is useful for the determination of

A. Molal heat capacities of gases
B. Heat capacities of solids
C. Activation energy
D. Heat capacities of gases

Question 430

Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10⁻³ T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is

A. 10.73 kJ
B. 16.15 kJ
C. 18.11 kJ
D. 18.33 kJ

Question 431

A sugar solution containing __________ percent sugar is equivalent to 1 Brix.

A. 0.01
B. 0.1
C. 1
D. 10

Question 432

Methane is mixed with stoichiometric proportion of oxygen and completely combusted. The number of additional specifications required to determine the product flow rate and composition is

A. 0
B. 1
C. 2
D. 3

Question 433

The heat of solution depends upon the

A. Nature of solvent
B. Concentration of solution
C. Nature of solute
D. All of the above

Question 434

A butane isomerisation process produces 70 kmole/hr of pure isobutane. A purge stream removed continuously, contains 85% n-butane and 15% impurity (mole%). The feed stream is n-butane containing 1% impurity (mole%). The flow rate of the purge stream will be

A. 3 kmole/hr
B. 4 kmole/hr
C. 5 kmole/hr
D. 6 kmole/hr

Question 435

The pressure under which liquid and vapor can co-exit at equilibrium is called the __________ vapor pressure.

A. Limiting
B. Real
C. Saturated
D. Normal

Question 436

A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is

A. N₂O₄
B. N₂O₅
C. N₂O₃
D. None of these

Question 437

The molar composition of a gas is 10% H₂, 10% O₂, 30% CO₂ and balance H₂O. If 50% H₂O condenses, the final mole percent of H₂ in the gas on a dry basis will be be

A. 10%
B. 5%
C. 18.18%
D. 20%

Question 438

A gaseous mixture contains 14 kg of N₂, 16 kg of O₂ and 17 kg of NH₃. The mole fraction of oxygen is

A. 0.16
B. 0.33
C. 0.66
D. 0.47

Question 439

At room temperature, the product [H⁺] [OH⁻] in a solution is 10⁻¹⁴ moles/litre. If, [OH⁻] = 10⁻⁶ moles/litre, then the pH of the solution will be

A. 6
B. 8
C. 10
D. 12