When the liquid phase and vapour phase of a binary system obeys Raoult’s and Dalton’s law respectively, the relative volatility is the ratio of________________________?

Related Mcqs:

1. Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component ‘A’ to that of component ‘B’, when_________________?

   A. Only vapor phase follows Raoult’s law
   B. Only liquid phase obeys Dalton’s law
   C. Liquid phase obeys Dalton’s law and vapor phase obeys Raoult’s law
   D. Vapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law

2. Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is _________________________?

   A. 5.6 × 10-4
   B. 8.5 × 10-4
   C. 5.6 × 10-3
   D. 8.5 × 10-3

3. 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

4. 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

5. 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

6. The relative volatility of a binary mixture at the Azeotropic composition is _______________________?

   A. 1
   B. > 1
   C. 0
   D. ∞

7. In a binary system, separation is very efficient, when the relative volatility is_______________?

   A. 1
   B. > 1
   C. < 1
   D. 0.5

8. With increase in pressure, the relative volatility for a binary system__________________?

   A. Increases
   B. Decreases
   C. Remains same
   D. Either A. or B., depends on the system

9. With increase in pressure, the relative volatility for a binary system_________________?

   A. Increases
   B. Decreases
   C. Remains same
   D. Either A. or B., depends on the system

10. For a binary mixture with low relative volatility, continuous rectification to get pure products will require_____________________?

    A. Low reflux ratio
    B. Less number of trays
    C. Small cross-section column
    D. High reflux ratio