Mass Transfer
Diffusion in concentrated solutins differs from that in dilute solutions, because of the change in the __________ with the concentration of the solution.

Viscosity
Degree of ideality
Neither A nor B
Both A & B

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Mass Transfer
Steam distillation is used to

Reduce the number of plates
Increase the efficiency of separation
Avoid thermal decomposition of a component
Increase the total pressure of distillation

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Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

Helps in increasing the settling rate of the bubbles
Comprises of thin bed of substances of extended surface having high porosity
Helps in increasing the bubble size entering the settler
All of these

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Mass Transfer
To get high tray efficiency

Interfacial surface between liquid and gas phase should be large
Time of contact between the two phases should be less
Gas velocity should be very low
Liquid entrainment should be severe

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