Stoichiometry Question Bank - Set 09 - ObjectiveBooks

Stoichiometry Question Bank - Set 09

Practice Test: Question Set - 09

1. 1 torr is equivalent to
    (A) 1 mm Hg
    (B) 1 Pascal
    (C) 1 atm
    (D) 1 mm wc

2. A vessel of volume 1000 m3 contains air which is saturated with water vapor. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapor pressure of water at 20°C is 2.34 kPa, the amount of water vapor (in kg) in the vessel is approximately
    (A) 17
    (B) 20
    (C) 25
    (D) 34

3. 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

4. Kinematic viscosity of 1 m2 /second is equivalent to _________ stokes.
    (A) 10
    (B) 102
    (C) 103
    (D) 104

5. A 'limiting reactant' is the one, which decides the _________ in the chemical reaction.
    (A) Equilibrium constant
    (B) Conversion
    (C) Rate constant
    (D) None of these

6. For water evaporating into unsaturated air under adiabatic conditions and at constant pressure, the ________ remains constant throughout the period of vaporization.
    (A) Dry bulb temperature
    (B) Wet bulb temperature
    (C) Humidity
    (D) Relative saturation

7. 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

8. 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

9. 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 1/4th
    (B) Increase four times
    (C) Increase two times
    (D) None of these

10. An oxidation process is accompanied by decrease in the
    (A) Number of electrons
    (B) Oxidation number
    (C) Number of ions
    (D) All (a), (b) & (c)

11. If the absolute temperature of an ideal gas is tripled and simultaneously the pressure is reduced to one third; then the volume of gas will
    (A) Remain unaltered
    (B) Increase nine fold
    (C) Increase three fold
    (D) Decrease three fold

12. 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 (a), (b) and (c)

13. 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 vapor in the product gases is about
    (A) 0.19
    (B) 0.33
    (C) 0.40
    (D) 0.67

14. Cv for monatomic gases is equal to(where, R = gas constant)
    (A) R
    (B) 1.5 R
    (C) 2R
    (D) 3R

15. 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

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