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Which of the following relation between driving force and unit operation is correct?

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Which of the following relation between driving force and unit operation is correct?

(a) Crystallization – relative solubility in different solvents

(b) Extraction – relative volatilities

(c) Absorption – freezing point difference

(d) Adsorption – relative adherence

This question was addressed to me in class test.

The question is from Natural Products topic in division Natural Products of Chemical Technology

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The correct option is (d) Adsorption – relative adherence

Easy explanation: The general driving force for any unit operation is concentration gradient or more precisely chemical potential. The correct option is that adsorption is based on relative adherence.

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