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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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H_{2} S

gas into a mixture of

M n^{2 +}, N i^{2 +}, C u^{2 +}

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ions in an acidified aqueous solution precipitates:

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H g^{2 +}

H_{2} S

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Q. Which of the following properties are common to the elements manganese, iron, cobalt, nickel and copper?

(I) Coloured ions in aqueous solution
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