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

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 2

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 3

The value of b, is?

A. 1.5

B. 2.5

C. 3.5

D. 4.5

Question 4

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 5

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

A. 0

B. ∞

C. 1

D. none of these

Question 6

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

A. 3

B. 6

C. 9

D. 12

Question 7

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 8

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

A. molality

B. mole fraction

C. weight percent

D. molarity

Question 9

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 10

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

A. 3

B. 6

C. 10

D. 14

Question 11

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 12

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 13

What is the value of d?

A. 1

B. 2

C. 3

D. 4

Question 14

What is the value of e?

A. 1

B. 3

C. 5

D. 7

Question 15

What is the value of b?

A. 1

B. 3

C. 5

D. 7

Question 16

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 17

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

A. isobars

B. isotones

C. isotopes

D. none of these

Question 18

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 19

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 20

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 21

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 22

Average molecular weight of air is about

A. 21

B. 29

C. 23

D. 79

Question 23

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

A. 24

B. 38

C. 46

D. 54

Question 24

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 25

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 26

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 27

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 28

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 29

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 30

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

A. accumulation

B. production

C. input

D. generation

Question 31

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 32

What is the value of b?

A. 1

B. 2

C. 3

D. 4

Question 33

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 34

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 35

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 36

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 37

Density of carbon dioxide is __________ kg/Nm3.

A. 44/22400

B. 44/22.4

C. 22.4/44

D. none of these

Question 38

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 39

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 40

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 41

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 42

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 43

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 44

What is the value of b?

A. 1

B. 3

C. 6

D. 9

Question 45

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 46

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 47

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 48

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 49

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

A. 10

B. 12

C. 13

D. 14

Question 50

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 51

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 52

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 53

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 54

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 55

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 56

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 57

What is the value of d?

A. 1

B. 4

C. 5

D. 6.5

Question 58

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 59

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 60

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 61

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 62

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 63

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 64

What is the value of c?

A. 2

B. 4

C. 6

D. 8

Question 65

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 66

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 67

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 68

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

A. 180

B. 360

C. 540

D. 720

Question 69

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 70

Solutions which distil without change in composition are called

A. ideal

B. saturated

C. supersaturated

D. azeotropic

Question 71

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 72

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

A. 21

B. 35

C. 41

D. 47

Question 73

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 74

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 75

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 76

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 77

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 78

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 79

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

A. 0.1013

B. 1.013

C. 10.13

D. 101.3

Question 80

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

A. 228

B. 328

C. 428

D. 528

Question 81

One micron is equal to

A. 10-4 mm

B. 10-4 cm

C. 10-6 m

D. both(b)&(c)

Question 82

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 83

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 84

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 85

What is the value of b?

A. 1

B. 4

C. 5

D. 6.5

Question 86

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 87

The value of d, is?

A. 1

B. 2

C. 3

D. 4

Question 88

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

A. 274

B. 275

C. 276

D. 277

Question 89

The value of c, is?

A. 2

B. 4

C. 6

D. 8

Question 90

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 91

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 92

What is the value of c?

A. 1

B. 4

C. 5

D. 6.5

Question 93

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 94

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 95

One Newton is equal to __________ dynes.

A. 102

B. 103

C. 104

D. 105

Question 96

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 97

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

A. 16

B. 21

C. 25

D. 32

Question 98

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 99

Which of the following is not a unit of pressure ?

A. Torr

B. Newton/m2

C. Parsec

D. Ata, bar or pascal

Question 100

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

A. 2

B. 3

C. 5

D. 8

Question 101

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 102

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 103

CaCO3 contains __________ percent of Ca by weight.

A. 40

B. 48

C. 96

D. 12

Question 104

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 105

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 106

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

A. 6

B. 1

C. 7

D. 10

Question 107

Kopp's rule is concerned with the calculation of

A. thermal conductivity.

B. heat capacity.

C. viscosity.

D. surface tension.

Question 108

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

A. 18

B. 36

C. 54

D. 72

Question 109

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 110

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 111

What is the value of c?

A. 1

B. 2

C. 3

D. 4

Question 112

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 113

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 114

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 115

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 116

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 117

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 118

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 119

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 120

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 121

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.