Which of the following compounds contains unpaired electrons?

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

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Solution

$K O_{2}, N O_{2}, C l O_{2}, O_{2}, N O$

$O_{2}$ is paramagetic and hence it has unpaired electrons, this can be proved using MOT.

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