Which of the following molecules/ion does not contain unpaired electrons ?

O_{2}^{2 -}

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B_{2}

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N_{2}^{+}

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O_{2}

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Solution

The correct option is B $O_{2}^{2 -}$
In $O_{2}^{2 -}$ all the electrons are paired and is diamagntic in nature.
In $B_{2}$ , $N_{2}^{+}$ and $O_{2}$ unpaired electrons are present and are paramagnetic in nature.

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