Peptization of $S n O_{2}$ by $N a O H$ gives:

[S n O_{2}] S n O_{3}^{2 -} : 2 {N a}^{+}

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[S n O_{2}] {S n}^{4 +} : O^{2 -}

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[S n O_{2}] N a : {O H}^{-}

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[S n O_{2}] {S n}^{4 +} : {O H}^{-}

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Solution

The correct option is A $[S n O_{2}] S n O_{3}^{2 -} : 2 {N a}^{+}$
The dispersion of a freshly precipitated material into colloidal solution by the action of an electrolyte in solution is termed peptization. The electrolyte used is called a peptizing agent. e.g. Freshly prepared stannic oxide on treatment with a small amount of dilute hydrochloric acid forms a stable colloidal solution of stannic oxide. i.e. $[S n O_{2}] S n O_{3}^{2 -} : 2 N a^{+}$

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