The compound which does not react with $K M n O_{4}$ is :

perdisulphuric acid.

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sulphurous acid.

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hydrogen sulphide.

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hydrogen peroxide.

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Solution

The correct option is A perdisulphuric acid.
In perudisulphuric acid (shown in the figure), $S$ is in its highest oxidation state $(+ 6)$ and so, it can not reduce $K M n O_{4}$ and itself get oxidised further.
However, all other given reagents can reduce $K M n O_{4}$ .

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