Which of the following gases with a smell of rotten egg is evolved when sulphuric acid is treated with copper sulphide?

Sulphur vapour

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Sulphur dioxide

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Hydrogen sulphide

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Sulphur trioxide

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Solution

The correct option is C Hydrogen sulphide
When Sulphuric acid is treated with copper sulphide then $H_{2} S$ gas is evolved, with a smell of rotten egg.
$C u S + H_{2} {S O}_{4} \to {C u S O}_{4} + H_{2} S (g)$
(Rotten egg smell)

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