Stoichiometry Objective Questions - Set 12 - ObjectiveBooks
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# Practice Test: Question Set - 12

1. Which of the following expressions defines the Baume gravity scale for liquids heavier than water?
(A) (141.5/G) - 131.5
(B) 145 - (145/G)
(C) 200 (G-1)
(D) (400/G) - 400

2. Ideal solution is formed, when its components have zero
(A) Heat of mixing
(B) Volume change
(C) Both (a) & (b)
(D) Neither (a) nor (b)

3. The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies
(A) XM < 0.5
(B) XM = 0.5
(C) 0.5 < XM < 0.64
(D) XM ≥ 0.64

4. Compressibility factor of a real gas is the ratio of the actual volume to that predicted by ideal gas law. As the pressure of the gas approaches zero, the compressibility factor approaches
(A)
(B) 0
(C) 1
(D) 0.24

5. The effect of pressure on the heat capacity of the gases _________ is negligible.
(A) At pressure below one atmosphere
(B) Below the critical temperature
(C) Both (a) & (b)
(D) Neither (a) nor (b)

6. CaCO3 contains ________ percent of Ca by weight.
(A) 40
(B) 48
(C) 96
(D) 12

7. The osmotic pressure of a solution increases, if its ________ is decreased.
(A) Volume
(B) Solute concentration
(C) Temperature
(D) None of these

8. One kg of saturated steam at 100°C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m3. It cools to 98°C; the saturation pressure is 0.943 bar ; one kg of water vapor under these conditions has a volume of 1.789 m3. The amount of water vapor condensed (in kg) is
(A) 0.0
(B) 0.065
(C) 0.1
(D) 1.0

9. A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the
(A) Atomic weight of the metal is 4
(B) Equivalent weight of the metal is 4
(C) Atomic weight of the metal is 2
(D) Equivalent weight of the metal is 8

10. The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapors of water and toluene, the mole fraction of water Xw in the vapor phase satisfies
(A) 0 < Xw < 0.5
(B) Xw = 0.5
(C) 0.5 < Xw < 1.0
(D) Xw = 1.0

11. Diffusion is that property by virtue of which a perfume bottle when opened up in a room, makes the whole room fragrant with its smell. If a perfume 'X' diffuses twice as fast as another perfume 'Y'; what is the molecular weight of 'Y', if the vapor density of gas 'X' is 2? Molecular weight of gas 'X' is to be assumed to be 2.
(A) 2
(B) 4
(C) 8
(D) 16

12. Gases diffuse faster compared to liquids because of the reason that the liquid molecules
(A) Are held together by stronger inter-molecular forces
(B) Move faster
(C) Have no definite shape
(D) Are heavier

13. The number of atoms of oxygen present in 11.2 liters of ozone (O3) at N.T.P. are
(A) 3.01 × 1022
(B) 6.02 × 1023
(C) 9.03 × 1024
(D) 1.20 × 1024

14. Enthalpy of formation of NH3 is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH3 → N2 + 3H2, is equal to ________ kJ/kg. mole.
(A) 46
(B) 92
(C) -23
(D) -92

15. N2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample? (Molecular weight of urea = 60)
(A) 80%
(B) 90%
(C) 95%
(D) 98%

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