Mass Transfer
Steam distillation is used for separation of high boiling

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

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Mass Transfer
In an operating distillation column, the

Highest temperature is encountered at the top of the column
Vapors and liquids are at their dew point and bubble point respectively
Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column
Driving force for the liquid flow is its specific weight

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