The compound which could not act both as oxidising and reducing agent

1.	The compound which could not act both as oxidising and reducing agent is
Answer» In `SO_(2)` the oxidation state of sulphur is `+4`. Since it can undergo an increase as well as decrease in its oxidation state, it can act both as oxidising and reducing agent. On the other hand, oxidation state of sulphur in `SO_(3)` is `+6` which is the maximum it can have. Since it can only decrease its oxidation state, sulphur trioxide `(SO_(3))` can act only as an oxidising agent.

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The compound which could not act both as oxidising and reducing agent is

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