Mass Transfer
Chemisorption (chemical adsorption) is

An irreversible phenomenon
Characterised by adsorption of heat
Same as "Van der Waals" adsorption
A reversible phenomenon

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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

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

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