Mass Transfer
Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is

At a fixed temperature
Non-ideal in nature
Insoluble in the liquid
Soluble in the liquid

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Mass Transfer
Flights in a rotary dryer are provided to

Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
Increase the residence time of the solid
Reduce the residence time of solid
None of these

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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,

Both the phases become identical at a particular common point on both the solubility curves called the plait point
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
All of these

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