The compound which could not act both as an o | vedclass

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(C) An oxidising agent is a substance that can be reduced (its oxidation state decreases),and a reducing agent is a substance that can be oxidised (it

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$Al_2O_3$

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(C) An oxidising agent is a substance that can be reduced (its oxidation state decreases),and a reducing agent is a substance that can be oxidised (its oxidation state increases).In $Al_2O_3$,the oxidation state of $Al$ is $+3$,which is its maximum possible oxidation state (group $13$).Therefore,$Al$ cannot be further oxidised,meaning $Al_2O_3$ cannot act as a reducing agent.In the other compounds,the central atom is in an intermediate oxidation state,allowing them to act as both oxidising and reducing agents.

The compound which could not act both as an oxidising as well as a reducing agent is:

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