Roasting of sulphides gives the gas X as a by-product. This is a...

Roasting of sulphides gives the gas

X

as a by-product. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic acts as a reducing agent and its acid has never been insolated. The gas

X

Options

A $\mathrm{H}_2 \mathrm{~S}$
B $\mathrm{SO}_2$
C $\mathrm{CO}_2$
D $\mathrm{SO}_3$

Correct answer

B. $\mathrm{SO}_2$

Step-by-step solution

\mathrm{SO}_2

gas is obtained when any sulphide ore is roasted.

2 \mathrm{M}_2 \mathrm{~S}+3 \mathrm{O}_2 \longrightarrow 2 \mathrm{M}_2 \mathrm{O}+2 \mathrm{SO}_2

This gas exhibits all the characteristics given in the question.

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