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Introduction to Oxidation and Reduction

Passing H 2S...

Question

Passing H $_{2}$ S gas into a mixture of manganese, nickel and copper ions in acidified aqueous solution precipitates:

A

CuS and HgS

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B

MnS and CuS

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C

MgS and NiS

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D

NiS and HgS

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Solution

The correct option is A CuS and HgS
Explanation:
$H_{2} S \leftrightarrow 2 H^{+} + S^{2 -}$
$C u a n d H g$ will precipitate as sulphides i.e. $H g S a n d C u S$
other have higher solubility product and they will remain unaffected.
Hence option A is correct

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