Among $K O_{2}$ , $A l O_{2}^{-}$ , $B a O_{2}$ and $N O_{2}^{+}$ unpaired electron is present in:

K O_{2}

only

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N O_{2}^{+}

and

B a O_{2}

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K O_{2}

and

A l O_{2}^{-}

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B a O_{2}

only

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Solution

The correct option is A $K O_{2}$ only
$K O_{2}$ exists in form of ion as $K^{+}, O_{2}^{-}$ and $O_{2}^{-}$ have one unpaired electron so this compound contains one unpaired electron.

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