Mass Transfer
Solvent used in extractive distillation

Is of low volatility
Forms a low boiling azeotrope
Does not alter the relative volatility of the original components
Forms a high boiling azeotrope

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Mass Transfer
Heat load in a cooling tower

Neither A nor B
Means the amount of heat thrown away (KCal/hr.) by the cooling tower
Is equal to the number of kg, of water circulated times the cooling range
Both A & B

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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
Total pressure is less
Saturated steam is used for steam distillation

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