Mass Transfer
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

Composition of vapors and that of liquid do not vary throughout the column
The top and bottom compositions correspond to the maximum enrichment available
Reboiler load and condenser load are minimum
The top and bottom compositions are unchanged with and without total reflux

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Mass Transfer
In steam distillation, the

Temperature is 100°C
Temperature is higher than the boiling point of either component
Temperature is more than 100° C
Product must be immiscible with water

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Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

All of these
Helps in increasing the settling rate of the bubbles
Helps in increasing the bubble size entering the settler
Comprises of thin bed of substances of extended surface having high porosity

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