Q82 / 180 · NEET 2013 (All India) · Chemistry

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 $X$ is

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

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.

Hence, the correct answer is option: 'B'.

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