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Question

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

A
Sulphur vapour
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B
Sulphur dioxide
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C
Hydrogen sulphide
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D
Sulphur trioxide
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Solution

The correct option is C Hydrogen sulphide
When Sulphuric acid is treated with copper sulphide then H2S gas is evolved, with a smell of rotten egg.
CuS+H2SO4CuSO4+H2S(g)
(Rotten egg smell)

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