Mass Transfer
In liquid extraction, if the selectivity is unity, then

Amount of solvent required will be minimum
Separation of the constituents is the most effective
No separation will occur
Solvent flow rate should be very low

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Mass Transfer
Flash distillation is

Same as differential distillation
Most useful for handling binary systems
Used for multicomponent systems like crude refining
Same as simple distillation

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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
As the acetone concentration increases, the solubility curves approach each other
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
Both the phases become identical at a particular common point on both the solubility curves called the plait point

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