Which of the following acts as both an oxidiz | vedclass

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(B) In $HNO_2$ (nitrous acid),the oxidation state of nitrogen is $+3$. Nitrogen can be oxidized to a higher oxidation state (e.g.,$+5$ in $HNO_3$) or

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$HNO_2$

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(B) In $HNO_2$ (nitrous acid),the oxidation state of nitrogen is $+3$. Nitrogen can be oxidized to a higher oxidation state (e.g.,$+5$ in $HNO_3$) or reduced to a lower oxidation state (e.g.,$+2$ in $NO$ or $0$ in $N_2$). Therefore,$HNO_2$ can act as both an oxidizing and a reducing agent. $HNO_3$ acts only as an oxidizing agent (nitrogen is in its maximum $+5$ state),$H_2SO_4$ acts primarily as an oxidizing agent,and $He$ is an inert noble gas.

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

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