Stoichiometry Practice Chemistry - Set 04 - ObjectiveBooks

# Practice Test: Question Set - 04

1. Pick out the wrong statement:
(A) Clausius-Clapeyron equation relates the latent heat of vaporisation to the slope of the vapor pressure curve
(B) At the boiling point of liquid at the prevailing total pressure, saturated absolute humidity is infinite
(C) Percentage saturation and relative saturation are numerically equal for an unsaturated vapor gas mixture
(D) Clapeyron equation is given by dP/dT = (λ/T) (VG - VL); where, P = vapor pressure, T = absolute temperature, λ = latent heat of vaporisation, VG and VL = volumes of gas and liquid respectively

2. The density of a liquid is 1500 kg/m3. Its value in gin/litre will be equal to
(A) 1.5
(B) 15
(C) 150
(D) 1500

3. Weight of 56 liters of ammonia at N.T.P. is ________ gm.
(A) 2.5
(B) 42.5
(C) 56
(D) 2800

4. Avogadro's number is equal to
(A) 6.023 × 1023 molecules/kg.mole
(B) 6.023 × 1023 molecules/gm.mole
(C) 6.023 × 1016 molecules/kg.mole
(D) 6.023 × 1026 molecules/gm.mole

5. The reverse process of fractional crystallization is called
(A) Stripping
(B) Leaching
(C) Differential distillation
(D) Absorption

6. The value of the gas-law constant 'R' is 1.987
(A) kcal/kg-mole.°C
(B) Btu/lb-mole.°R
(C) kcal/kg-mole.°K
(D) Both (b) & (c)

7. Which of the following is the Clausius-Clapeyron Equation?
(A) PV = RT + B/V + y/V2 + ....
(B) (P + a/V2)(V-b) = RT
(C) loge (p/p0) = (λ/R) (1/T0 - 1/T)
(D) p = [RT/(V - b)] - (a/TV2)

8. The atomic heat capacities of all solid elements ________ with decrease in temperature.
(A) Increases
(B) Decreases
(C) Remains unchanged
(D) Approach zero at 0°C

9. The value of Trouton's ratio (λb/Tb) for a number of substances is 21 (where, λb = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, °K). The Kistyakowsky equation is used for calculation of Trouton's ratio of ________ liquids.
(A) Polar
(B) Non-polar
(C) Both (a) & (b)
(D) Neither (a) nor (b)

10. How many phases are present at eutectic point?
(A) 2
(B) 1
(C) 3
(D) Unpredictable

11. Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3. The diffusivity of aniline in air is 0.74 × 10-5m2/s. The numerical value of mass transfer co-efficient is 7.4 × 10-3. Its units are
(A) m/s
(B) cm/s
(C) mole/m2.s.Pa
(D) k.mole/m2.s.Pa

12. Measurement of the amount of dry gas collected over water from volume of moist gas is based on the
(A) Charle's law
(B) Dalton's law of partial pressures
(D) Boyle's law

13. Pick out the wrong unit conversion of thermal conductivity.
(A) 1 BTU/ft2.hr.°F/ft = 1.488 kcal/m2. hr.°C/m
(B) 1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2. hr.°C/m
(C) 1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K
(D) 1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F

14. Saturated molal absolute humidity of the vapor-gas mixture depends upon the
(A) Vapor pressure at dry bulb temperature
(B) Total pressure
(C) Both (a) and (b)
(D) Neither (a) nor (b)

15. For any system, the ________ heat of solution is dependent on the temperature and the adsorbate concentration.
(A) Integral
(B) Differential
(C) Both (a) & (b)
(D) Neither (a) nor (b)

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