Mass Transfer
Critical humidity of a solid salt means the humidity

Both A and B
Above Which it will always become dry and below which it will always stay damp
Above which it will always become damp
Below which it will always stay dry

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

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
Pr = Sc ; there won

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