Mass Transfer
Reboiler is considered as one theoretical plate, because

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

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Mass Transfer
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that

The system comprises of miscible liquids
The system comprises of an azeotrope
The system comprises of partially mis-cible liquids
On heating, a vapor phase will appear ; while on cooling, a solid phase will appear

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