If $\mathrm{FeCl}_3$ is added to hot water, a positively charged sol, hydrated ferric oxide is formed due to adsorption of $\mathrm{Fe}^{3+}$ ions.
$\mathrm{Fe}_2 \mathrm{O}_3 . \times \mathrm{H}_2 \mathrm{O} / \mathrm{Fe}^{3+}$
Positively charged.
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