Q47 / 180 · AIIMS 2005 · Chemistry

Assertion : Reaction of $\mathrm{SO}_2$ and $\mathrm{H}_2 \mathrm{~S}$ in the presence of $\mathrm{Fe}_2 \mathrm{O}_3$ catalyst gives elemental sulphur. Reason : $\mathrm{SO}_2$ is a reducing agent.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion
  • Correct answer
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion
  • C
    If assertion is true but reason is false
  • D
    If both assertion and reason are false.

Solution

$\mathrm{SO}_2$ shows both oxidising as well as reducing nature. The reaction given in assertion is due to oxidising nature of $\mathrm{SO}_2$. $$ 2 \mathrm{H}_2 \mathrm{~S}+\mathrm{SO}_2 \rightarrow 2 \mathrm{H}_2 \mathrm{O}+3 \mathrm{~S} $$

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

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