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

{N O}_{2}^{+}

and

B a O_{2}

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{K O}_{2}

and

A l O_{2}^{-}

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{K O}_{2}

only

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B a O_{2}

only

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Solution

The correct option is D ${K O}_{2}$ only
${K O}_{2}$ has unpaired electron.
${K O}_{2}$ has $K^{+} O_{2}^{-}$ structure having one unpaired electron.

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