Mass Transfer
A binary mixture of benzene and cyclohexane is separated by

Flash vaporisation
Extractive distillation
Ordinary distillation
Solvent extraction

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Multicomponent distillation is involved
Mixture (to be separated) shows negative deviation from ideality
Mixture (to be separated) shows positive deviation from ideality
Relative volatility is reasonably constant

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Mass Transfer
Entrainer used in azeotropic distillation should

Form a low boiling azeotrope with one of the constituents of the mixture
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

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