Which of the following can be used both as an oxidant and a reductant?

H N O_{2}

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S O_{2}

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O_{2}

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C O

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Solution

The correct options are
A $H N O_{2}$
B $S O_{2}$
C $O_{2}$
D $C O$
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.
Compound Oxidation state
$H N O_{2}$ $+ 3 (N)$
$S O_{2}$ $+ 4 (S)$
$O_{2}$ $0 (O)$
$C O$ $+ 2 (C)$
As all the compounds have elements in the intermediate oxidation state (i.e. greater than minimum and less than maximum), therefore, all can be used as an oxidizing agent and a reducing agent both.

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