Mass Transfer
Inside the distillation column, the

Liquids are not always at their bubble points
Pressure increases gradually from bottom to the top of the column
Driving force for the vapour flow is the pressure drop
None of these

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Mass Transfer
Steam distillation is used to

Increase the efficiency of separation
Increase the total pressure of distillation
Avoid thermal decomposition of a component
Reduce the number of plates

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