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Question

Sulphuric acid on reaction with sodium sulphide results in the evolution of a gas X with rotten egg smell. Identify the gas X.

A
Carbon monoxide
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B
Sulphur dioxide
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C
Nitrogen dioxide
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D
Hydrogen sulphide
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Solution

The correct option is D Hydrogen sulphide
Sulphuric acid reacts with sodium sulphide to give sodium sulphate and hydrogen sulphide (H2S) gas.

Na2S(s)+H2SO4(aq)Na2SO4(aq)+H2S(g)

H2S gas is colourless, highly flammable and has a characterisitc rotten egg smell. When inhaled in large quantities, hydrogen sulphide causes headache to humans.

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