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Which one of the following is not explained by adsorption?

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When acetic acid solution is shaken with charcoal the concentration of the acid decreases.

The white precipitate of Mg(OH)₂ attains blue colour when precipitated in the presence of magneson reagent

The air becomes dry in the presence of silica gel.

An aqueous solution of NaOH attains pink colour with a drop of phenolphthalein.

answer is D.

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Detailed Solution

Colour of the indicator changes due to change in pH and not because of adsorption.

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