Related Mcqs:

1. The-relative volatility for separation of a non-ideal binary mixture by distillation should be ___________________?

   A. 0
   B. 1
   C. > 1
   D. < 1

2. According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the column ?

   A. 5
   B. 9
   C. 12
   D. 28

3. Components, having widely different boiling point in a binary mixture, can be separated using ________________ distillation?

   A. Molecular
   B. Extractive
   C. Steam
   D. Simple

4. One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect ?

   A. The product composition but not the fraction vaporised
   B. The product composition as well as the fraction vaporised
   C. The fraction vaporised but not the product composition
   D. Neither the product composition nor the fraction vaporised

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. 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

7. The diffusivity D. in a binary gas mixture is related to the pressure (P) as___________________?

   A. D ∝ P0.5
   B. D ∝ 1/P0.5
   C. D ∝ 1/P
   D. D ∝ 1/P1.5

8. The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________________?

   A. D ∝ P0.5
   B. D ∝ 1/P0.5
   C. D ∝ 1/P
   D. D ∝ 1/P1.5

9. 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

10. 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