Mass Transfer
In which of the following unit operations, the selectivity is an important parameter?

Absorption
Solvent extraction
None of these
Distillation

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

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

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