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

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

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

4. 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

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

   A. 1
   B. > 1
   C. 0
   D. ∞

6. 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

7. In case of ______________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated?

   A. Molecular
   B. Azeotropic
   C. Extractive
   D. Flash

8. 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________________________?

   A. Vapour pressure of component A to that of component B
   B. Vapour pressure of component A to the total pressure
   C. Vapour pressure of component A to the partial pressure of A
   D. Partial pressure of component A to the total pressure

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. 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