Multiple Choice Questions Chemistry Stoichiometry - Set 07 - ObjectiveBooks

Multiple Choice Questions Chemistry Stoichiometry - Set 07

Practice Test: Question Set - 07

1. The vapor pressure of water at 100°C is
    (A) 100 N/m2
    (B) 76 cms of Hg
    (C) 13.6 cms of Hg
    (D) 760 mm wc

2. Pick out the wrong statement.
    (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
    (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
    (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
    (D) A supersaturated solution of a sparingly soluble solute, at a concentration of C, is being fed to a crystallizer at a volumetric flow rate of V. The solubility .of the solute is C1. The output rate of solids from an efficient crystallizer is (C + C1V

3. Heat of transition is the heat evolved or absorbed, when a substance is converted from
    (A) Vapor to liquid
    (B) Vapor to solid
    (C) Solid to liquid
    (D) One allotropic form to another allotropic form

4. Except for monatomic gases, the molal heat capacity at constant volume for all gases is ________ Kcal/Kg mole.° K.
    (A) 3
    (B) > 3
    (C) < 3
    (D) < 1

5. Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution).
    (A) log (1/H+)
    (B) - log (1/H+)
    (C) 1/log H+
    (D) None of these

6. The crystallization of a solute from a solution may be done by
    (A) Removal of pure solvent by evaporation
    (B) Change of temperature thereby causing super-saturation
    (C) Changing the nature of the system by the addition of a more soluble material
    (D) All (a), (b) & (c)

7. ________ fuels require the maximum percentage of 'excess air' for complete combustion.
    (A) Solid
    (B) Liquid
    (C) Gaseous
    (D) Nuclear

8. Boiling point of a non-homogeneous mixture of immiscible liquids is ________ that of any one of its separate components.
    (A) Lower than
    (B) Higher than
    (C) Equal to
    (D) Either (a) or (b); depends on the liquids

9. The forces causing the vaporization of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporization
    (A) Increases with pressure rise
    (B) Decreases with increasing pressure
    (C) Becomes zero at the critical point
    (D) Both (b) & (c)

10. The vapor pressure of a solution (made by dissolving a solute in a solvent) is ________ that of the pure solvent.
    (A) Less than
    (B) More than
    (C) Equal to
    (D) Either more or less; depends on the solvent

11. In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is
    (A) Independent of the temperature
    (B) Increased with the increase in pressure
    (C) Decreased with the increase in pressure
    (D) Unchanged by the pressure change

12. At what temperature, given mass of a gas that occupies a volume of 2 liters at N.T.P. will occupy a volume of 4 liters, if the pressure of the gas is kept constant?
    (A) 273°C
    (B) 273°K
    (C) 100°C
    (D) 200°C

13. 1m3 is approximately equal to
    (A) 28 liters
    (B) 35 ft3
    (C) 4.5 liters
    (D) 4.5 ft3

14. 2 liters of nitrogen at N.T.P. weighs ________ gms.
    (A) 14
    (B) 2.5
    (C) 28
    (D) 1.25

15. Which of the following gravity scales is used exclusively for liquids heavier than water?
    (A) Baume scale
    (B) Twaddell scale
    (C) API scale
    (D) None of these

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