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

Extractive distillation
Ordinary distillation
Flash vaporisation
Solvent extraction

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Mass Transfer
Entrainer used in azeotropic distillation should

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

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