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Hydrogen Peroxide

An aqueous so...

Question

An aqueous solution contains following ions $H g_{2}^{2 +}, H g^{2 +}, P b^{2 +}$ and $C d^{2 +}$ . On adding $H$ which of these will precipitate?

H g_{2} C l_{2}

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P b C l_{2}

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H g_{2} C l_{2}

and

P b C l_{2}

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H g C l_{2}

and

P b C l_{2}

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Solution

The correct option is D $H g_{2} C l_{2}$ and $P b C l_{2}$
$H g_{2}^{2 +}$ and $P b^{2 +}$ have been placed in I group of basic radicals as their $K_{s p}$ are less than the II group ions $(H g^{2 +}, C d^{2 +})$ . Hence, only these will precipitate.

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