Mass Transfer
Mass transfer co-efficient is defined as

Co-efficient = Flux/concentration difference
Flux=concentration difference/co-effi-cient
None of the listed here
Flux = Co-efficient/concentration difference

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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,

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
As the acetone concentration increases, the solubility curves approach each other
All of these

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Mass Transfer
Flash distillation is

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

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Mass Transfer
Entrainer used in azeotropic distillation should

Form a new azeotrope of low relative volatility with one of the constituents of the mixture
Have high latent heat of vaporisation
Have high viscosity to provide high tray efficiency
Form a low boiling azeotrope with one of the constituents of the mixture

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