Mass Transfer
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 coloumn.

12
10
8
6

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Mass Transfer
The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp = M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force.)

Kc = Kp . RT = Km . RT/p
Kc = Kp/RT = Km . RT/P
None of these
Kc = Kp = Km

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Mass Transfer
In a counter-current liquid extractor

Only one of the liquids may be pumped at any desired rate
Liquid's flow rate depends upon the temperature and pressure
Both liquids can have any desired flow rate
Both liquids flow at fixed rate

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