Mass Transfer
In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.

Extractive
Molecular
Flash
Azeotropic

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

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

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