Solved Problems on Stoichiometry - Set 16 - ObjectiveBooks

Solved Problems on Stoichiometry - Set 16

Practice Test: Question Set - 16

1. Mass number of an atom is the sum of the numbers of
    (A) Neutrons and protons
    (B) Protons and electrons
    (C) Neutrons and electrons
    (D) Both (a) & (b)

2. Number of gm moles of solute dissolved in 1 kg of solvent is called its
    (A) Normality
    (B) Molarity
    (C) Molality
    (D) Formality

3. Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the
    (A) Same elevation in boiling point
    (B) Different elevation in boiling point
    (C) Elevation in boiling point in the ratio of their molecular weights
    (D) None of these

4. Boiling point of a solution as compared to that of the corresponding solvent is
    (A) Less
    (B) More
    (C) Same
    (D) Either more or less; depends upon the solvent

5. Kopp's rule is helpful in finding the
    (A) Heat capacities of solids
    (B) Heat capacities of gases
    (C) Molal heat capacities of gases
    (D) Activation energy

6. 6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H2 produced will be ________ gm.
    (A) 0.5
    (B) 1
    (C) 3
    (D) 5

7. Number of gram equivalent of solute dissolved in one liter of solution is called its
    (A) Normally
    (B) Molarity
    (C) Molality
    (D) Formality

8. With increase in the temperature of pure (distilled) water, its
    (A) pOH decreases and pH increases
    (B) pOH and pH both decreases
    (C) pH and pOH both increases
    (D) pH decreases and pOH increases

9. Which of the following is an exothermic reaction?
    (A) Conversion of graphite to diamond
    (B) Decomposition of water
    (C) Dehydrogenation of ethane to ethylene
    (D) None of these

10. Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the 'corresponding states'. At equal reduced conditions i.e., at the corresponding state, the ________ of different gases are nearly the same.
    (A) Compressibility
    (B) Molecular weight
    (C) Humidity
    (D) None of these

11. Addition of a non-volatile solute to a solvent produces a ________ in its solvent.
    (A) Freezing point elevation
    (B) Boiling point depression
    (C) Vapor pressure lowering
    (D) All (a), (b) & (c)

12. The evaporation of aqueous solution of sugar causes its molarity to
    (A) Decrease
    (B) Increase
    (C) Remain unchanged
    (D) Either (a) or (b); depends on the concentration of the solution

13. 1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 liters of gas at NTP per hour?
    (A) 5
    (B) 10
    (C) 15
    (D) 20

14. What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100°C, if their vapor pressures at 100°C are 1340, 560 and 210 mmHg respectively ?
    (A) 756.2
    (B) 780.5
    (C) 801.5
    (D) 880.5

15. Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is
    (A) 10.73 kJ
    (B) 16.15 kJ
    (C) 18.11 kJ
    (D) 18.33 kJ

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