On adding few drops of dil. HCl to freshly precipitated ferric hydroxide, a red coloured colloidal solution is obtained. The phenomenon is known as :

protective action

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flocculation

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coagulation

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peptisation

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Solution

The correct option is D peptisation
Peptization is the process of forming stable colloids by using an electrolyte to break up a precipitate and disperse it into the colloid

Hence, option D is correct.

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