Positive deviation from Raoult’s law means a mixture whose total pressure is___________________?

Related Mcqs:

1. An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively. The humidity of air sample expressed as kg of water vapour/kg of dry air is__________________?

   A. 0.048
   B. 0.079
   C. 0.122
   D. 0.152

2. The wet and ‘dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be ______________ °C ?

   A. 25
   B. > 25
   C. < 25
   D. – 25

3. The wet and ‘dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be ______________ °C?

   A. 25
   B. > 25
   C. < 25
   D. – 25

4. At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is ________________ percent.?

   A. 100
   B. 0
   C. 50
   D. Between 0 and 100

5. Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid) ?

   A. p = P
   B. p >>P
   C. p < P
   D. p << P

6. The relative volatility of a binary mixture at constant temperature _________________ the total pressure?

   A. Decreases with increase in
   B. Increases with increase in
   C. Is independent of
   D. None of these

7. _____________ is the temperature at which a gas-vapor mixture becomes saturated, when cooled at constant total pressure out of contact with a liquid ?

   A. Dew point
   B. Bubble point
   C. Dry bulb temperature
   D. Wet bulb temperature

8. The dew point of an unsaturated gas-vapor mixture does not depend upon the _________________ of the mixture?

   A. Composition
   B. Temperature
   C. Total pressure
   D. All A, B. and C.

9. The dew point of an unsaturated gas-vapor mixture does not depend upon the ____________________ of the mixture?

   A. Composition
   B. Temperature
   C. Total pressure
   D. All A., B. and C.

10. A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture ?

    A. The mixture exhibits an azeotrope at 101.3 kPa
    B. The composition of the mixture, in percent by volume is: o-xylene 30, p-xylene 60. and mxylene
    10
    C. The composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10
    D. The mixture contain optical isomers