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  4. The nature of charge on resulting colloidal particles when FeCl 3 is added to excess of hot water is :

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Q. The nature of charge on resulting colloidal particles when $FeCl _{3}$ is added to excess of hot water is :

JEE MainJEE Main 2021Surface Chemistry

Solution:

If $FeCl _{3}$ is added to hot water, a positively charged sol, hydrated ferric oxide is formed due to adsorption of $Fe ^{3+}$ ions.

$Fe _{2} O _{3} . xH _{2} O / Fe ^{3+}$

Positively charged.