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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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
Reboiler load and condenser load are minimum
The top and bottom compositions correspond to the maximum enrichment available
The top and bottom compositions are unchanged with and without total reflux

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Mass Transfer
For a ternery mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates.

Binary mixture is represented by the apex
Binary mixture is represented by any point inside
Pure component is represented by the apex
Ternery mixture is represented by the sides

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