Mass Transfer
Only small amount of evaporation of water produces large cooling effects because of its

Large latent heat
Low viscosity
Small latent heat
None of these

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Mass Transfer
Entrainer used in azeotropic distillation should

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
Have high latent heat of vaporisation

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Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Temperature is less
Saturated steam is used for steam distillation
Total pressure is less

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