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Question

When mercury is reacted with hot and conc. sulphuric acid, the gas evolved is:

A
H2S
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B
SO2
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C
SO3
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D
O2
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Solution

The correct option is B SO2
2Hg+2H2SO4(conc.)Hg2SO4+SO2+2H2O
Thus it forms SO2 as a gas.

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