Stoichiometry

Free 222+ Stoichiometry MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

222 MCQs availableFull MCQ list →Past Papers & Resources →

About this subject

Stoichiometry

Practice questions

Showing page 1 of 12. Select an option to practise inline.

Open full list →

Show Answers

Correct options are highlighted when revealed.

1.Identify the incorrect statement from the following options:

The Clausius-Clapeyron equation connects the latent heat of vaporization with the slope of the vapor pressure curve.At a liquid's boiling point under the existing total pressure, the saturated absolute humidity becomes infinite.For a vapor-gas mixture that is not saturated, the values of percentage saturation and relative saturation are the same numerically.The Clapeyron equation is expressed as dP/dT = (λ/T) (V_G - V_L), where P is vapor pressure, T is absolute temperature, λ is latent heat of vaporization, and V_G and V_L are the specific volumes of gas and liquid, respectively.

2.Identify the incorrect statement from the following options:

To prepare 100 kg of a solution with 40% salt by mixing two solutions—solution A containing 25% salt and solution B containing 50% salt—the quantity of solution A needed is 40 kg.When 1.2 gram-atoms of carbon reacts with 1.5 gram-moles of oxygen to form 1 gram-mole of carbon dioxide, carbon is the limiting reagent and the excess oxygen supplied is 25%.If a gas bubble at pressure Pg passes through a solvent whose saturation vapor pressure is Ps, and the bubble passage is sufficiently long with air being insoluble, then the mole fraction of solvent in the bubble equals Ps divided by Pg.A supersaturated solution of a sparingly soluble solute with concentration C flows into a crystallizer at volumetric flow rate V. Given the solubility is C1, the solid product output rate from an efficient crystallizer is (C - C1) × V.

3.Identify the incorrect statement from the following options:

Diluting a normal solution (N) by a factor of ten decreases its normality to N divided by 10.Mixing equal masses of oxygen and methane in a sealed container at room temperature results in oxygen exerting half of the total pressure.At NTP, 9.034 × 10^23 oxygen atoms in ozone (O3) occupy a volume of 11,200 cubic centimeters.One kilomole of an ideal gas occupies 22,400 normal cubic meters at NTP.

4.Identify the incorrect unit conversion related to calorific value from the options below:

1 kcal/kg equals 1.8 BTU per pound and 4.186 kJ/kg1 BTU per cubic foot corresponds to 8.9 kcal per cubic meter and 0.038 MJ per cubic meter1 BTU per pound is equivalent to 2.3 kcal per kilogram1 kcal per cubic meter is equal to 0.1124 BTU per cubic foot

5.Identify the incorrect statement regarding reduced properties of a substance.

'Reduced temperature' is defined as the ratio of the current temperature to the critical temperature, with both temperatures measured in degrees Celsius.'Reduced pressure' refers to the ratio of the current pressure of a substance to its critical pressure.'Reduced volume' is the ratio of the current molar volume of a substance to its critical molar volume.None of the above statements are incorrect.

6.Identify the incorrect statement from the following:

The heat capacity of a diatomic gas exceeds that of a monatomic gas.Equal volumes of Argon and Krypton gases have the same number of atoms.At NTP, 22.4 liters of hydrogen gas contains 6.023 × 10²³ molecules.A binary mixture exhibiting the same composition in both vapor and liquid phases is called an azeotropic mixture.

7.Identify the incorrect statement from the following options:

A vapor is called saturated when its partial pressure matches the equilibrium vapor pressure.A vapor with partial pressure lower than the equilibrium vapor pressure is known as a superheated vapor.The boiling point is defined as the temperature at which a vapor becomes saturated.The term 'degree of superheat' refers to the difference between the current vapor temperature and its saturation temperature (dew point).

8.What is the equivalent value of 1 ata in terms of pressure units?

9.For a solution (excluding solids dissolved in liquids) where the overall volume is smaller than the combined volumes of its pure components, how does solubility behave?

Not affected by temperature variationsEnhances as pressure increasesGrows when pressure decreasesRemains constant despite pressure changesVaries unpredictably with pressure

10.At 100°C, both water and methylcyclohexane exhibit a vapor pressure of 1 atm. Their respective latent heats of vaporization at this temperature are 40.63 kJ/mol for water and 31.55 kJ/mol for methylcyclohexane. Given that the vapor pressure of water rises to 4.69 atm at 150°C, what would be the expected vapor pressure of methylcyclohexane at 150°C?

11.Given that pure water boils at 100°C and pure toluene boils at 110.6°C, and knowing that water and toluene do not mix, what is the temperature at which an evenly mixed equimolar combination of these two liquids will exert a total pressure of one atmosphere?

12.Given that benzene does not dissolve in water, and their respective normal boiling points are 80.1°C for benzene and 100°C for water, what will be the boiling point of a benzene-water mixture at 1 atm pressure?

13.What is the value of the compressibility factor for an ideal gas?

14.When does an azeotropic mixture of two liquids exhibit a boiling point that is lower than that of either pure component?

19.The osmotic pressure of a dilute solution containing a non-volatile solute in a solvent that follows Raoult’s law is directly proportional to which of the following?

TemperatureSolution volumeQuantity of non-volatile solute in molesNone of the above

20.If the pressure of a dry gas with an initial volume of 'V' liters is raised from 1 kgf/cm² to 2 kgf/cm² while keeping the temperature constant, what will be the resulting volume?

How to prepare with Stoichiometry MCQs

Work through questions topic by topic, then revisit any you answered incorrectly.
Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
Pair subject practice with past papers to see how Stoichiometry appears in real exam conditions.

Stoichiometry

About this subject

Practice questions

1.Identify the incorrect statement from the following options:

2.Identify the incorrect statement from the following options:

3.Identify the incorrect statement from the following options:

4.Identify the incorrect unit conversion related to calorific value from the options below:

5.Identify the incorrect statement regarding reduced properties of a substance.

6.Identify the incorrect statement from the following:

7.Identify the incorrect statement from the following options:

8.What is the equivalent value of 1 ata in terms of pressure units?

9.For a solution (excluding solids dissolved in liquids) where the overall volume is smaller than the combined volumes of its pure components, how does solubility behave?

11.Given that pure water boils at 100°C and pure toluene boils at 110.6°C, and knowing that water and toluene do not mix, what is the temperature at which an evenly mixed equimolar combination of these two liquids will exert a total pressure of one atmosphere?

12.Given that benzene does not dissolve in water, and their respective normal boiling points are 80.1°C for benzene and 100°C for water, what will be the boiling point of a benzene-water mixture at 1 atm pressure?

13.What is the value of the compressibility factor for an ideal gas?

14.When does an azeotropic mixture of two liquids exhibit a boiling point that is lower than that of either pure component?

15.What do we call a vapor whose partial pressure is lower than its equilibrium vapor pressure?

16.Which formula correctly represents the API gravity based on specific gravity (G) measured at 15.5°C?

17.Which type of energy is included in the internal energy of a substance?

18.What characteristic must isotonic solutions share to be considered isotonic?

19.The osmotic pressure of a dilute solution containing a non-volatile solute in a solvent that follows Raoult’s law is directly proportional to which of the following?

20.If the pressure of a dry gas with an initial volume of 'V' liters is raised from 1 kgf/cm² to 2 kgf/cm² while keeping the temperature constant, what will be the resulting volume?

How to prepare with Stoichiometry MCQs

More on PakQuizHub