Mass Transfer
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.

Total
Minimum
Operating
Maximum permissible

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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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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
The top and bottom compositions correspond to the maximum enrichment available
Composition of vapors and that of liquid do not vary throughout the column
Reboiler load and condenser load are minimum

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