Mass Transfer
The binary diffusivity in gases does not depend upon the

None of the listed here
Temperature
Pressure
Nature of the components

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Mass Transfer
The rate of solid-liquid extraction is limited by the

All of these
Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution
Phase change of the solute as it dissolves in the solvent
Diffusion of the solute through the solvent in the pores to the outside of the particle

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

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

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