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Common Ion Effect

Hg22+ when re...

Question

$H g_{2}^{2 +}$ when reacts with $H_{2} S$ , black ppt. (A) formed which when reacts with $N a_{2} S$ followed by filtration leaving behind black ppt. (B). The filtrate with $H^{+}$ gives black ppt. (C). A, B and C are :

H g_{2} S, H g, H g S

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H g + H g S, H g S, H g

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H g + H g S, H g, H g S

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H g_{2} S, H g S, H g

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Solution

The correct option is C $H g + H g S, H g, H g S$
$H g_{2}^{2 +} + H_{2} S \to + 2 H^{+} + H g + H g S$ (black ppt) (A)
$H g S + N a_{2} S \to N a_{2} S_{2} + H g$ (black ppt)
The filtrate with $H^{+}$ gives black ppt, $H g S$ .

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