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Surface chemistry NCERT book Solutions


Q 5.1. Distinguish between the meaning of the terms adsorption and absorption. Give one example of each.

Ans: This phenomenon of attracting and retaining the molecules of a substance by a solid or a liquid on its surface resulting into a higher concentration of the molecules on the surface is known as adsorption.

In absorption, the substance is uniformly distributed throughout the body of a solid or a liquid.

Water vapours are absorbed by anhydrous calcium chloride but adsorbed by silica gel.

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