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Common Ion Effect

ZnS is not pr...

Question

$Z n S$ is not precipitated by passing $H_{2} S$ in acidic medium but $C u S$ precipitated. The reason for it is:

K_{s p} C u S << K_{s p} Z n S

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K_{s p} C u S >> K_{s p} Z n S

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K_{s p} C u S = K_{s p} Z n S

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None of these

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Solution

The correct option is A $K_{s p} C u S << K_{s p} Z n S$
Precipitation of salt $A B$ will occur when $K_{s p} < [A^{+}] [B^{-}]$ .
$Z n S$ is not precipitated by passing $H_{2} S$ in acidic medium but $C u S$ precipitated because by analysing above equation it is clear that $K_{s p} C u S << K_{s p} Z n S$ .

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0.1 M

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