Stoichiometry Test Quizlet - Set 20 - ObjectiveBooks

# Practice Test: Question Set - 20

1. At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/liter. If, [OH-] = 10-6 moles/liter, then the pH of the solution will be
(A) 6
(B) 8
(C) 10
(D) 12

2. A gaseous mixture contains 14 kg of N2, 16 kg of O2 and 17 kg of NH3. The mole fraction of oxygen is
(A) 0.16
(B) 0.33
(C) 0.66
(D) 0.47

3. The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is
(A) Termed as relative saturation
(B) Not a function of the composition of gas mixture
(C) Called percentage saturation
(D) Not a function of the nature of vapor

4. Number of gm moles of solute dissolved in one liter of a solution is called its
(A) Equivalent weight
(B) Molarity
(C) Molality
(D) Normality

5. Molar heat capacity of water in equilibrium with ice at constant pressure is
(A) 0
(B)
(C) 1
(D) None of these

6. In a neutral solution
(A) H+ ions are absent
(B) OH- ions are absent
(C) Both H+ and OH- ions are present in very small but equal concentration
(D) None of these

7. The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the
(A) Relative humidity
(B) Relative saturation
(C) Percentage saturation
(D) None of these

8. Hess's law of constant heat summation is based on conservation of mass. It deals with
(A) Equilibrium constant
(B) Reaction rate
(C) Changes in heat of reaction
(D) None of these

9. Density of carbon dioxide is ________ kg/Nm3.
(A) 44/22400
(B) 44/22.4
(C) 22.4/44
(D) None of these

10. A gas mixture contains 6 moles of H2 and 2 moles of N2. If the total pressure of the gaseous mixture is 4 kgf/cm2; then the partial pressure of N2 in the mixture will be ________ kgf/cm2.
(A) 1
(B) 2
(C) 4
(D) 8

11. No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules
(A) Collide without loss of energy
(B) Do work equal to loss in kinetic energy
(C) Are above the inversion temperature
(D) Exert no attractive force on each other

12. The temperature of a gas in a closed container is 27° C. If the temperature of the gas is increased to 300° C, then the pressure exerted is
(A) Doubled
(B) Halved
(C) Trebled
(D) Unpredictable

13. Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is
(A) 1/9
(B) 8/9
(C) 1/2
(D) 5/9

14. Pick out the correct statement.
(A) A substance existing above its critical temperature is called a saturated vapor
(B) A mixture of vapor gas is called saturated, if the equilibrium vapor pressure of the liquid is more than the partial pressure of the vapor at the same temperature
(C) Heat added to or given up by a substance at constant temperature is called the sensible heat
(D) The end points of a vapor-pressure vs. temperature curve are critical and triple points

15. pH value of a solution containing 1 gm of hydrogen ion per liter will be
(A) 0
(B) 1
(C) 7
(D) 10

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