Mass Transfer
Boiling point diagram is

Affected by pressure
A plot of temperature vs. vapour composition
A plot of temperature vs. liquid composition
Not affected by pressure

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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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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,

The top and bottom compositions are unchanged with and without total reflux
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

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Mass Transfer
In case of a desorber (stripper), the

Operating line always lies above the equilibrium curve
Temperature always increases
Temperature remains unaffected
Operating line always lies below the equilibrium curve

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