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(D) In $NaNO_2$,the oxidation state of nitrogen $(N)$ is $+3$. Nitrogen can be oxidized to a higher oxidation state (e.g.,$+5$ in $NO_3^-$) and reduce

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$NaNO_2$

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(D) In $NaNO_2$,the oxidation state of nitrogen $(N)$ is $+3$. Nitrogen can be oxidized to a higher oxidation state (e.g.,$+5$ in $NO_3^-$) and reduced to a lower oxidation state (e.g.,$+2, +1, 0, -3$). Therefore,$NaNO_2$ can act as both an oxidizing agent and a reducing agent. In $NaNO_3$,$N$ is in its maximum oxidation state $(+5)$,so it acts only as an oxidizing agent. In $Na_2O_2$,oxygen is in $-1$ state,which can be oxidized to $0$ or reduced to $-2$,but $NaNO_2$ is the classic example of a compound showing dual behavior due to the intermediate oxidation state of $N$.

Which of the following substances acts as both an oxidizing agent and a reducing agent?

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