A freshly formed precipitate of $S n O_{2}$ is peptized by a small amount of NaOH. These colloidal particles may be represented as :

[S n O_{2}] S n O_{3}^{2 -}; 2 N a^{\oplus}

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

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[S n O_{2}] N a^{\oplus}; O H^{⊖}

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[S n O_{2}] S n^{4 +}; O H^{\oplus}

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Solution

The correct option is C $[S n O_{2}] S n O_{3}^{2 -}; 2 N a^{\oplus}$
A freshly formed precipitate of $S n O_{2}$ is peptized by a small amount of NaOH. These colloidal particles may be represented as :

$[S n O_{2}] S n O_{3}^{2 -}; 2 N a^{\oplus}$
$S n O_{2}$ adsorbes negatively charged $S n O_{3}^{2 -}$ ions and is surrounded by $N a^{+}$ ions which maintains electrical neutrality.

Hence,option A is correct.

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