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What is the process called when the molecules of a substance are retained at the surface of a solid or a liquid?

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in Chemistry – Class 12 by (188k points)
What is the process called when the molecules of a substance are retained at the surface of a solid or a liquid?

(a) Absorption

(b) Adsorption

(c) Sorption

(d) Desorption

The question was posed to me during an interview.

I'd like to ask this question from Surface Chemistry topic in section Surface Chemistry of Chemistry – Class 12

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Right option is (b) Adsorption

Easiest explanation: Adsorption is the process which involves the accumulation of the molecules of a substance in higher concentration on the surface of a solid or a liquid. For example, gasses are adsorbed on the surface of charcoal.

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