Mass Transfer
Reboiler is considered as one theoretical plate, because

Reboiler itself contains one plate
None of these
Of the assumption that vapour and liquid leaving the reboiler are in equilibrium
Vapour is recycled to the column

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

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

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