Mass Transfer
In rectifying section of a continuous distillation column, the

Vapour is enriched with high boilers
None of these
Vapour is enriched with low boilers
Liquid is stripped of high boilers

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Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
Temperature of the liquid phase is equal to that of the vapor phase
All of these
Total pressure throughout the liquid phase is equal to that throughout the vapor phase

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