Which of the following contains unpaired electron?

{N O}_{2}

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{C O}_{2}

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{N O}_{2}^{-}

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{C N}^{-}

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Solution

The correct option is B ${N O}_{2}$
Species having odd no. of total electrons contain unpaired electrons. Out of given options , only $N O_{2}$ has 23 electrons. Hence, $N O_{2}$ has unpaired electrons.

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K O_{2}, N O_{2}, S O_{2}, B a O_{2}, C l O_{2}, O_{2}, N O, N_{2} O, O_{3}, C O

K O_{2}, N O_{2}, S O_{2}, B a O_{2}, C l O_{2}, O_{2}, N O, N_{2} O, O_{3}, C O

K O_{2}, N O_{2}, N O

K_{2} O_{2}

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

K O_{2}, A I O_{2}^{-}, B a O_{2}

N O_{2}^{+}

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