Mass Transfer
When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system,

All of these
The distribution curve which is a plot between x (acetone concentration in one phase) and y (acetone concentration in other phase) is analogous to x-y curve used in distillation and absorption termina
As the acetone concentration increases, the solubility curves approach each other
Both the phases become identical at a particular common point on both the solubility curves called the plait point

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Liquid flow increases while the vapor flow decreases for a system
Number of plates decreases very slowly first and then more and more rapidly
Slope of the operating line in stripping section decreases
Total cost first decreases and then increases

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