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On adding few drops of dilute \( H C l \) or \( \boldsymbol{F} \boldsymbol{e} \boldsymbol{C l}_{3} \) to freshly precipitated ferric hydroxide, a red coloured colloidal solution is obtained. This phenomenon is known as:

1. peptization
2. dialysiss
3. protection
4. dissolution

Correct answer: peptization

Solution

The red colloidal solution forms when freshly precipitated ferric hydroxide is dispersed into colloidal particles by dilute HCl or FeCl3. This conversion of a precipitate into a colloid is called peptization.

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