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  4. Assertion: Reaction of SO2 and H2S in the presence of Fe2O3 catalyst gives elemental sulphur. Reason: SO2 is a reducing agent.

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Q. Assertion : Reaction of $SO_2$ and $H_2S$ in the presence of $Fe_2O_3$ catalyst gives elemental sulphur.
Reason : $SO_2$ is a reducing agent.

AIIMSAIIMS 2005Redox Reactions

Solution:

$H _{2} S$ and $SO _{2}$ react as follows.
image
In this reaction $SO _{2}$ is oxidising agent and $H _{2} S$ is reducing agent.
Thus, assertion is true but reason is false.