Answer:
\[F{{e}^{3+}}\] ions present in the
solution are adsorbed on \[Fe{{(OH)}_{3}}\]. The positively charged particles
formed mutually repel and get disintegrated resulting in a reddish brown
colloidal sol.
\[\underset{\text{(ppt}\text{.)}}{\mathop{Fe{{(OH)}_{3}}}}\,\,\,\,+\,\,\,\underset{\text{(electrolyte)}}{\mathop{F{{e}^{3+}}}}\,\,\,\,\xrightarrow{\,}\,\,\,\,\underset{\text{Colloidal}\,\,\text{sol}\text{.}}{\mathop{[Fe{{(OH)}_{3}}]F{{e}^{3+}}}}\,\]
This process of converting a
freshly precipitated substance into colloidal solution is called peptisation.
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