MCQs Related to Stoichiometry - Set 21 - ObjectiveBooks

# Practice Test: Question Set - 21

1. Total energy at a point comprises of _________ energy.
(A) Potential & kinetic
(B) Pressure
(C) Internal
(D) All (a), (b) & (c)

2. 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

3. A sugar solution containing ________ percent sugar is equivalent to 1 Brix.
(A) 0.01
(B) 0.1
(C) 1
(D) 10

4. 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

5. 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 vaporized. 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

6. 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

7. The heat capacity of most substances is greater for the ________ state.
(A) Solid
(B) Liquid
(C) Gaseous
(D) None of these

8. 1 torr is equal to ________ mm Hg column.
(A) 1
(B) 0.1
(C) 10
(D) 1000

9. Isotopes are atoms having the same
(A) Mass number
(B) Number of neutrons
(C) Atomic mass
(D) None of these

10. Saturated solution of benzene in water is in equilibrium with a mixture of air and vapors of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapor pressures of benzene and water at these conditions are pvB and pvw respectively. The partial pressure of benzene in air-vapor mixture is
(A) PvB
(B) xB.PvB
(C) (Patm - Pvw)xB
(D) xB.Patm

11. Which of the following is not a unit of kinematic viscosity?
(A) Poise
(B) Stoke
(C) cm2/second
(D) None of these

12. 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)

13. Osmotic pressure exerted by a solution prepared by dissolving one gram mole of a solute in 22.4 liters of a solvent at 0°C will be ________ atmosphere.
(A) 0.5
(B) 1
(C) 1.5
(D) 2

14. 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)

15. With increase in the solute concentration, the specific heat of aqueous solutions
(A) Increases
(B) Decreases
(C) Remains unchanged
(D) Either (a) or (b); depends on the type of solution

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