Which of the following case act as both oxidising and reducing agent?

H_{2} S

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H_{2} S O_{4}

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S O_{2}

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S O_{3}

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Solution

The correct option is C $S O_{2}$
In ${S O}_{2}$ , $S$ is in oxidation state that is $+ I V$ and its highest oxidation state is $+ V I$ . Hence, can act both as reducing agent and oxidising agent.

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