Mass Transfer
Wetted wall tower experiment determines the

Molal diffusivity
Volumetric co-efficient
None of these
Mass transfer co-efficient

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Mass Transfer
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that

On heating, a vapor phase will appear ; while on cooling, a solid phase will appear
The system comprises of miscible liquids
The system comprises of partially mis-cible liquids
The system comprises of an azeotrope

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Mass Transfer
In case of an absorber, the operating

Line always lies above the equilibrium curve
Line can be either above or below the equilibrium curve
Velocity is more than the loading velocity
Line always lies below the equilibrium curve

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