Stoichiometry Multiple Choice Questions and Answers doc - Set 03 - ObjectiveBooks

# Practice Test: Question Set - 03

1. With rise in temperature, the solubility of ammonia in water at a fixed pressure
(A) Increases
(B) Decreases
(C) Remains unchanged
(D) Increases exponentially

2. One of the specific gravity scales is "Brix" (used specifically for sugar solution). It is defined as
(A) Brix = (400/G) - 400
(B) Brix = 200 (G-1)
(C) Brix = 145 - (145/G)
(D) None of these

3. For an ideal solution, the total vapor pressure varies _________ with the composition (expressed as mole fraction).
(A) Inversely
(B) Exponentially
(C) Linearly
(D) Negligibly

4. With rise in temperature, the heat capacity of a substance
(A) Increases
(B) Decreases
(C) Remains unchanged
(D) Either (a) or (b); depends on the substance

5. The unit of specific heat at constant pressure, Cp, in SI unit is
(A) W/m2°C
(B) J/kg°K
(C) W/m°K
(D) J/m3°K

6. For a neutral solution (pH = 7), the value of [H+] [OH-] is equal to
(A) 0
(B) 1
(C) < 1
(D) > 1

7. Kopp's rule is useful for the determination of
(A) Molal heat capacities of gases
(B) Heat capacities of solids
(C) Activation energy
(D) Heat capacities of gases

8. A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is
(A) N2O4
(B) N2O5
(C) N2O3
(D) None of these

9. One micron is equal to ________ cm.
(A) 10-2
(B) 10-4
(C) 10-6
(D) 10-8

10. The heat capacity of a solid compound is calculated from the atomic heat capacities of its constituent elements with the help of the
(A) Trouton's rule
(B) Kopp's rule
(C) Antoine equation
(D) Kistyakowsky equation

11. A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal
(A) Kinetic energy
(B) Intermolecular forces of attraction
(C) Potential energy
(D) Total energy

12. A solution with reasonably permanent pH is called a/an ________ solution.
(A) Ideal
(B) Non-ideal
(C) Buffer
(D) Colloidal

13. A saturated vapor on being compressed would
(A) Condense
(B) Form wet steam
(C) Both (a) & (b)
(D) Neither (a) nor (b)

14. Molality is defined as the number of gm moles of solute per ________ of solvent.
(A) Liter
(B) kg
(C) gm.mole
(D) gm

15. Pick out the wrong statement.
(A) Atomic heat capacities of the crystalline solid elements are nearly constant and equal to 6.2 kcal/kg-atom according to the law of Petit and Dulong
(B) Atomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperature, when in the crystalline state
(C) Generally, the heat capacities of compounds are lower in the liquid than in the solid state
(D) The heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist

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