Mass Transfer
Steam distillation is used for separation of high boiling

Volatile impurity from still higher boiling substances
Substances from non-volatile impurities
none of the listed here
Both of the options given here

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

Temperature is less
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

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