# 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**

*X*satisfies_{M}- (A)

*X*< 0.5

_{M}- (B)

*X*= 0.5

_{M}- (C) 0.5 <

*X*< 0.64

_{M}- (D)

*X*≥ 0.64

_{M}**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. CaCO**

_{3}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 m**

^{3}. 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 m^{3}. 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**

*X*in the vapor phase satisfies^{w}- (A) 0 <

*X*< 0.5

_{w}- (B)

*X*= 0.5

_{w}- (C) 0.5 <

*X*< 1.0

_{w}- (D)

*X*= 1.0

_{w}**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 (O**

_{3}

**) at N.T.P. are**

- (A) 3.01 × 10

^{22}

- (B) 6.02 × 10

^{23}

- (C) 9.03 × 10

^{24}

- (D) 1.20 × 10

^{24}

**14. Enthalpy of formation of NH**

_{3}is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH_{3}→ N_{2}+ 3H_{2}, is equal to ________ kJ/kg. mole.- (A) 46

- (B) 92

- (C) -23

- (D) -92

**15. N**

_{2}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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