Mass Transfer
Can the efficiency of a plate in the distillation tower be greater than 100%?

Never
Normally not; but is possible if infinite number of plates are put
Yes
Yes ; if the reflux ratio is maximum

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

Viscosity of liquid components is very high
One of the liquid components has very high affinity towards the solvent
One of the liquid components is heat sensitive
Extracting solvent is cheaply & abundantly available

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