# 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 d

*P*/d

*T*= (

*λ*/

*T*)

*(*

*V*-

_{G}*V*); where,

_{L}*P*= vapor pressure,

*T*= absolute temperature,

*λ*= latent heat of vaporisation,

*V*and

_{G}*V*= volumes of gas and liquid respectively

_{L}**2. The density of a liquid is 1500 kg/m**

^{3}. 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 × 10

^{23}molecules/kg.mole

- (B) 6.023 × 10

^{23}molecules/gm.mole

- (C) 6.023 × 10

^{16}molecules/kg.mole

- (D) 6.023 × 10

^{26}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*/

*V*+ ....

^{2}- (B) (

*P*+

*a*/

*V*

^{2})(

*V-b*) =

*RT*

- (C) log

_{e}(

*p*/

*p*

_{0}) = (

*λ*/

*R*) (1/

*T*

_{0}- 1/

*T*)

- (D)

*p*= [

*RT*/(

*V*-

*b*)] - (

*a*/

*TV*

^{2})

**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 (**

*λ*/_{b}*T*) for a number of substances is 21 (where,_{b}*λb*= molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and*T*= normal boiling point, °K). The Kistyakowsky equation is used for calculation of Trouton's ratio of ________ liquids._{b}- (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/m**

^{3}. The diffusivity of aniline in air is 0.74 × 10^{-5}m^{2}/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/m

^{2}.s.Pa

- (D) k.mole/m

^{2}.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

- (C) Avogadro's hypothesis

- (D) Boyle's law

**13. Pick out the wrong unit conversion of thermal conductivity.**

- (A) 1 BTU/ft

^{2}.hr.°F/ft = 1.488 kcal/m

^{2}. hr.°C/m

- (B) 1 BTU/ft

^{2}.hr.°F/inch = 1.488 kcal/m

^{2}. 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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