Mass Transfer
Pick out the system with minimum boiling azeotrope at 1 atm.

Hydrochloric acid-water
Benzene-toluene
Ethyl alcohol-water
All of these

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Mass Transfer
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition
Is more accurate than Ponchan-Savarit method
Uses molal units for material and energy balance
Can use any type of units

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

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Mass Transfer
Entrainer used in azeotropic distillation should

Have high latent heat of vaporisation
Form a new azeotrope of low relative volatility with one of the constituents of the mixture
Have high viscosity to provide high tray efficiency
Form a low boiling azeotrope with one of the constituents of the mixture

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