Stoichiometry MCQs

Option A: 0.1013

Option B: 1.013

Option C: 10.13

Option D: 101.3

Correct Answer: 1.013 ✔

Option A: x1/x2

Option B: x2/x1

Option C: 1 – (x1/x2)

Option D: 1/x2

Correct Answer: x1/x2 ✔

Option A: Weight

Option B: Number

Option C: Volume

Option D: Radius

Correct Answer: Number ✔

Option A: Decreases with increased temperature

Option B: Decreases as pressure increases

Option C: Becomes zero at the critical point

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Isobars

Option B: Isotones

Option C: Isotopes

Option D: None of these

Correct Answer: Isotopes ✔

Option A: Eutectic point

Option B: Boyle temperature

Option C: Boiling point

Option D: Critical temperature

Correct Answer: Eutectic point ✔

Option A: Higher than

Option B: Smaller than

Option C: Equal to

Option D: Either A. or B.; depends on the system

Correct Answer: Smaller than ✔

Option A: Measures the elevation in boiling point

Option B: Is not dependent on the temperature

Option C: Is a function of the liquid phase composition

Option D: Measures the depression in freezing point

Correct Answer: Is a function of the liquid phase composition ✔

Option A: 5 – 200 milli-microns

Option B: 50 – 200 microns

Option C: 500 – 1000 microns

Option D: 10 – 50 Angstrom

Correct Answer: A. 5 – 200 milli-microns ✔

Option A: 10.73 kJ

Option B: 16.15 kJ

Option C: 18.11 kJ

Option D: 18.33 kJ

Correct Answer: 18.11 kJ ✔

Option A: 5

Option B: 10

Option C: 15

Option D: 20

Correct Answer: 10 ✔

Option A: Freezing point elevation

Option B: Boiling point depression

Option C: Vapor pressure lowering

Option D: All A., B. & C.

Correct Answer: Vapor pressure lowering ✔

Option A: pOH decreases and pH increases

Option B: pOH and pH both decreases

Option C: pH and pOH both increases

Option D: pH decreases and pOH increases

Correct Answer: pOH and pH both decreases ✔

Option A: 0.5

Option B: 1

Option C: 3

Option D: 5

Correct Answer: 0.5 ✔

Option A: Less

Option B: More

Option C: Same

Option D: Either more or less; depends upon the solvent

Correct Answer: More ✔

Option A: Normality

Option B: Molarity

Option C: Molality

Option D: Formality

Correct Answer: Molality ✔

Option A: 1

Option B: 2

Option C: 3

Option D: 4

Correct Answer: 2 ✔

Option A: 10

Option B: 1

Option C: 0.1

Option D: 1000

Correct Answer: 1 ✔

Option A: 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar

Option B: 1 kg/hr.m2.atm= 0.98687 kg/hr. m .bar

Option C: 1 lb/hr.ft2 = 4.8823 kg/hr.m2

Option D: 1 kg/hr.m2 = 4.8823 lb/hr.ft2

Correct Answer: 1 kg/hr.m2 = 4.8823 lb/hr.ft2 ✔

Option A: Heat of solvation

Option B: Heat of hydration

Option C: Standard integral heat of solution

Option D: Heat of mixing

Correct Answer: Heat of mixing ✔

Option A: Increases

Option B: Decreases

Option C: Remains unchanged

Option D: Either A. or B.; depends on the liquid

Correct Answer: Decreases ✔

Option A: Inventory changes do not take place

Option B: Ratio of streams entering/leaving are independent of time

Option C: Flow rates & composition both are time dependent

Option D: None of these

Correct Answer: Flow rates & composition both are time dependent ✔

Option A: 1 atm absolute pressure & 0°C

Option B: 760 mm Hg gauge pressure & 0°C

Option C: 760 torr & 15°C

Option D: 101.325 KPa gauge pressure & 0°C

Correct Answer: 1 atm absolute pressure & 0°C ✔

Option A: 109

Option B: 10-12

Option C: 1012

Option D: 1015

Correct Answer: 109 ✔

Option A: Deviate from ideal gas behaviour to the same degree

Option B: Have nearly the same compressibility factor

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: No component is concentrated at the surface of the solution

Option B: The component molecules are non polar and are of almost equal size

Option C: In the formation of solution, chemical combination/molecular association between unlike

Option D: The attractive forces between like and unlike molecules are almost equal

Correct Answer: C. In the formation of solution, chemical combination/molecular association between unlike
molecules takes place ✔

Option A: Basic

Option B: More acidic

Option C: Neutral

Option D: Of the same acidity

Correct Answer: Basic ✔

Option A: Total pressure

Option B: Absolute humidity at a given temperature

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: 6.02 × 1023 atoms of hydrogen

Option B: 4 gm atoms of hydrogen

Option C: 3.01 × 1023 molecules of methane

Option D: 3 gms of carbon

Correct Answer: 4 gm atoms of hydrogen ✔

Option A: 10

Option B: 100

Option C: 1000

Option D: 10000

Correct Answer: 10 ✔

Option A: Phase rule

Option B: Experimental data

Option C: Empirical equations

Option D: Theoretical equations

Correct Answer: Phase rule ✔

Option A: Ideal

Option B: Saturated

Option C: Supersaturated

Option D: Azeotropic

Correct Answer: Azeotropic ✔

Option A: Solvent is from low concentration to high concentration region

Option B: Solvent is from high concentration to low concentration region

Option C: Solute takes place

Option D: None of these

Correct Answer: Solvent is from low concentration to high concentration region ✔

Option A: J/kg.°K

Option B: 0°K

Option C: W/m2.°C

Option D: W/m.°K

Correct Answer: J/kg.°K ✔

Option A: Molality

Option B: Mole fraction

Option C: Weight percent

Option D: Molarity

Correct Answer: Molarity ✔

Option A: 13728 J

Option B: 19206 J

Option C: 4576 J

Option D: 12712 J

Correct Answer: 19206 J ✔

Option A: 46

Option B: 92

Option C: -23

Option D: -92

Correct Answer: 92 ✔

Option A: Are held together by stronger inter-molecular forces

Option B: Move faster

Option C: Have no definite shape

Option D: Are heavier

Correct Answer: Are held together by stronger inter-molecular forces ✔

Option A: Be reduced to 1/4th

Option B: Increase four times

Option C: Increase two times

Option D: None of these

Correct Answer: Increase two times ✔

Option A: The route/method through which final products are obtained

Option B: The physical state (e.g., solid, liquid or gaseous) of reactants and products

Option C: Whether the reaction is carried out at constant temperature or constant pressure

Option D: None of these

Correct Answer: The route/method through which final products are obtained ✔

Option A: Equilibrium constant

Option B: Conversion

Option C: Rate constant

Option D: None of these

Correct Answer: Conversion ✔

Option A: Decrease in mean free path

Option B: Increased collision rate among molecules

Option C: Increase in molecular attraction

Option D: Increase in average molecular speed

Correct Answer: Increase in molecular attraction ✔

Option A: 1 mm Hg

Option B: 1 Pascal

Option C: 1 atm

Option D: 1 mm wc

Correct Answer: 1 mm Hg ✔

Option A: 0.2500

Option B: 0.2528

Option C: 0.5000

Option D: 0.5055

Correct Answer: 0.5055 ✔

Option A: 273°

Option B: 300°

Option C: 400°

Option D: 373°

Correct Answer: 400° ✔

Option A: Xc > Xs

Option B: Xc = Xs

Option C: Xc < Xs

Option D: Xc greater/less than Xs depending on the length of the cylinder

Correct Answer: Xc < Xs ✔

Option A: Triple point

Option B: Boyle’s temperature

Option C: Eutectic point

Option D: Inversion temperature

Correct Answer: B. Boyle’s temperature ✔

Option A: Increased yield

Option B: Enrichment of product

Option C: Heat conservation

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Pressure

Option B: Volume

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Dalton’s

Option B: Amagat’s

Option C: Gay-Lussac’s

Option D: Avogadro’s

Correct Answer: Amagat’s ✔

Option A: Baume scale

Option B: Twaddell scale

Option C: API scale

Option D: None of these

Correct Answer: Twaddell scale ✔

Option A: 28 litres

Option B: 35 ft3

Option C: 4.5 litres

Option D: 4.5 ft3

Correct Answer: 35 ft3 ✔

Option A: Independent of the temperature

Option B: Increased with the increase in pressure

Option C: Decreased with the increase in pressure

Option D: Unchanged by the pressure change

Correct Answer: Decreased with the increase in pressure ✔

Option A: Increases with pressure rise

Option B: Decreases with increasing pressure

Option C: Becomes zero at the critical point

Option D: Both B. & C.

Correct Answer: D. Both B. & C. ✔

Option A: Solid

Option B: Liquid

Option C: Gaseous

Option D: Nuclear

Correct Answer: Solid ✔

Option A: log (1/H+)

Option B: – log (1/H+)

Option C: 1/log H+

Option D: None of these

Correct Answer: log (1/H+) ✔

Option A: Vapor to liquid

Option B: Vapor to solid

Option C: Solid to liquid

Option D: One allotropic form to another allotropic form

Correct Answer: One allotropic form to another allotropic form ✔

Option A: 100 N/m2

Option B: 76 cms of Hg

Option C: 13.6 cms of Hg

Option D: 760 mm wc

Correct Answer: 76 cms of Hg ✔

Option A: 10-3

Option B: 10-10

Option C: 10-11

Option D: 10-13

Correct Answer: 10-11 ✔

Option A: Energy is lost during molecular collisions

Option B: Molecules possess appreciable volume

Option C: Absolute temperature is a measure of the kinetic energy of molecules

Option D: None of these

Correct Answer: Absolute temperature is a measure of the kinetic energy of molecules ✔

Option A: 5

Option B: 7

Option C: > 7

Option D: < 7

Correct Answer: 7 ✔

Option A: Solutes which dissociate or associate in the particular solution

Option B: Concentrated solutions

Option C: Both B. & C.

Option D: Solutions containing non-volatile solute

Correct Answer: C. Both B. & C. ✔

Option A: The strong base and strong acid reacts completely

Option B: The salt formed does not hydrolyse

Option C: Only OH- and H+ ions react in every case

Option D: The strong base and strong acid reacts in aqueous solution

Correct Answer: Only OH- and H+ ions react in every case ✔

Option A: 57.46

Option B: -57.46

Option C: 114.92

Option D: -28.73

Correct Answer: 57.46 ✔

Option A: Boyle’s law

Option B: Amagat’s law

Option C: Raoult’s law

Option D: Trouton’s rule

Correct Answer: C. Raoult’s law ✔

Option A: -109.5

Option B: +109.5

Option C: +180

Option D: +100

Correct Answer: -109.5 ✔

Option A: Clausius-Clapeyron equation relates the latent heat of vaporisation to the slope of the vapor pressure curve

Option B: At the boiling point of liquid at the prevailing total pressure, saturated absolute humidity is infinite

Option C: Percentage saturation and relative saturation are numerically equal for an unsaturated vapor gas mixture

Option 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 = volumes of gas and liquid respectively

Correct Answer: Percentage saturation and relative saturation are numerically equal for an unsaturated vapor gas mixture ✔

Option 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

Option 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

Option 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 solvent, the mole fraction of solvent in the bubble will be equal to Ps/Pg

Option 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 of solids from an efficient crystalliser is (C + C1) V

Correct Answer: 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 of solids from an efficient crystalliser is (C + C1) V ✔

Option A: Ten times dilution of a normal solution (N) reduces its normality to N/10

Option B: When equal weights of oxygen and methane are mixed in an empty reactor at room

Option C: Volume occupied by 9.034 x 1023 atoms of oxygen in ozone (O3) at NTP will be 11200 c.c

Option D: One kg mole of an ideal gas at N.T.P occupies 22400 Nm3

Correct Answer: One kg mole of an ideal gas at N.T.P occupies 22400 Nm3 ✔

Option A: 1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg

Option B: 1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3

Option C: 1 BTU/lb = 2.3 kcal/kg

Option D: 1 kcal/m3 = 0.1124 BTU/ft3

Correct Answer: 1 BTU/lb = 2.3 kcal/kg ✔

Option A: ‘Reduced temperature’ of a substance is the ratio of its existing temperature to its critical temperature, both expressed on Celsius scale

Option B: ‘Reduced pressure’ is the ratio of the existing pressure of a substance to its critical pressure

Option C: ‘Reduced volume’ is the ratio of the existing molal volume of a substance to its critical molal volume

Option D: None of these

Correct Answer: A. ‘Reduced temperature’ of a substance is the ratio of its existing temperature to its critical temperature, both expressed on Celsius scale ✔

Option A: Heat capacity of a diatomic gas is higher than that of a monatomic gas

Option B: Equal volumes of Argon and Krypton contain equal number of atoms

Option C: Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 1023

Option D: The binary mixture of a particular composition in both vapor and liquid state is known as an azeotropic mixture

Correct Answer: Equal volumes of Argon and Krypton contain equal number of atoms ✔

Option A: A vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure

Option B: A vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a ‘superheated vapor’

Option C: The temperature at which a vapor is saturated is termed as the boiling point

Option D: The difference between the existing temperature of a vapor and its saturation temperature (i.e.dew point) is called its ‘degree of superheat’

Correct Answer: The temperature at which a vapor is saturated is termed as the boiling point ✔

Option A: 1 atm

Option B: 10 torr

Option C: 0.98 Pascal

Option D: 1 kgf/cm2

Correct Answer: 1 kgf/cm2 ✔

Option A: Independent of temperature

Option B: Increases with rise in pressure

Option C: Increased with decrease in pressure

Option D: Unchanged with pressure changes

Correct Answer: Increases with rise in pressure ✔

Option A: Significantly less than 4.69 atm

Option B: Nearly equal to 4.69 atm

Option C: Significantly more than 4.69 atm

Option D: Indeterminate due to lack of data

Correct Answer: Significantly more than 4.69 atm ✔

Option A: Less than 100°C

Option B: 100°C

Option C: Between 100 and 110°C

Option D: 110.6°C

Correct Answer: Between 100 and 110°C ✔

Option A: 80.1°C

Option B: Less than 80.1°C

Option C: 100°C

Option D: Greater than 80.1°C but less than 100°C

Correct Answer: 80.1°C ✔

Option A: Decreases with pressure rise

Option B: Is unity at all temperature

Option C: Is unity at Boyle’s temperature

Option D: Zero

Correct Answer: Is unity at all temperature ✔

Option A: Is saturated

Option B: Is unsaturated

Option C: Shows negative deviation from Raoult’s law

Option D: Shows positive deviation from Raoult’s law

Correct Answer: D. Shows positive deviation from Raoult’s law ✔

Option A: Saturated

Option B: Superheated

Option C: Unsaturated

Option D: Dry gaseous

Correct Answer: Superheated ✔

Option A: °API = 200(G – 1)

Option B: °API = (141.5/G) – 131.5

Option C: °API = (140/G) – 130

Option D: °API = 145 – (145/G)

Correct Answer: B. °API = (141.5/G) – 131.5 ✔

Option A: Vibrational

Option B: Rotational

Option C: Translational

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Viscosity

Option B: Molar concentration

Option C: Normality

Option D: Critical temperature

Correct Answer: Molar concentration ✔

Option A: Temperature

Option B: Volume of solution

Option C: Moles of non-volatile solute

Option D: None of these

Correct Answer: Temperature ✔

Option A: V/2

Option B: 2V

Option C: V/4

Option D: V2

Correct Answer: V/2 ✔

Option A: P/3

Option B: 3P

Option C: 9P2

Option D: 9P

Correct Answer: P/3 ✔

Option A: 102

Option B: 103

Option C: 104

Option D: 105

Correct Answer: 105 ✔

Option A: Exhibits positive deviation from Raoult’s law

Option B: Exhibits negative deviation from Raoult’s law

Option C: Obeys Raoult’s law

Option D: May exhibit either positive or negative deviation from Raoult’s law

Correct Answer: A. Exhibits positive deviation from Raoult’s law ✔

Option A: 56

Option B: 100

Option C: 144

Option D: 1000

Correct Answer: 100 ✔

Option A: Solute concentration

Option B: Temperature

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Molal concentration

Option B: Reciprocal of the molal concentration

Option C: Normality

Option D: Molarity

Correct Answer: Molal concentration ✔

Option A: 756.2

Option B: 780.5

Option C: 801.5

Option D: 880.5

Correct Answer: 801.5 ✔

Option A: Decrease

Option B: Increase

Option C: Remain unchanged

Option D: Either A. or B.; depends on the concentration of the solution

Correct Answer: Remain unchanged ✔

Option A: Compressibility

Option B: Molecular weight

Option C: Humidity

Option D: None of these

Correct Answer: Compressibility ✔

Option A: Conversion of graphite to diamond

Option B: Decomposition of water

Option C: Dehydrogenation of ethane to ethylene

Option D: None of these

Correct Answer: None of these ✔

Option A: Normally

Option B: Molarity

Option C: Molality

Option D: Formality

Correct Answer: Normally ✔

Option A: Heat capacities of solids

Option B: Heat capacities of gases

Option C: Molal heat capacities of gases

Option D: Activation energy

Correct Answer: Heat capacities of solids ✔

Option A: Same elevation in boiling point

Option B: Different elevation in boiling point

Option C: Elevation in boiling point in the ratio of their molecular weights

Option D: None of these

Correct Answer: Same elevation in boiling point ✔

Option A: Neutrons and protons

Option B: Protons and electrons

Option C: Neutrons and electrons

Option D: Both A. & B.

Correct Answer: D. Both A. & B. ✔