Which of the following compounds acts both as an oxidising as well as a reducing agent?

H N O_{2}

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H_{2} O_{2}

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H_{2} S

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S O_{2}

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Solution

The correct options are
B $H_{2} O_{2}$
C $H N O_{2}$
D $S O_{2}$
The element in a molecule having its oxidation state in the middle ( greater than minimum and less than maximum) can be used as an oxidising agent and a reducing agent both.
The compounds and the oxidation states of the element are given below:
$H N O_{2}$
+3 (N)
$H_{2} O_{2}$
-1 (O)
$H_{2} S$
-2 (S)
$S O_{2}$
+4 (S)
Hence, $H N O_{2}$ , $H_{2} O_{2}$ and $S O_{2}$ can be used both as oxidising and reducing agent.

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