Mass Transfer
For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams

Passes through a maximum
Decreases
Increases
Remains unaffected

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Mass Transfer
Pick out the wrong statement pertaining to leaching.

Fine solids can not be leached in a Pachuka tank
Vegetable seeds can be leached in either of Bollman extractor, Rotocel or Kennedy extractor
Door classifier can be used for leaching of coarse solids
Very high temperature is not needed for the leaching of sugar beet

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Mass Transfer
In case of absorption with exothermic reaction, for fluids having

Pr = Sc ; there won
Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence
Both A & B
Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same

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