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

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$N_{2}^{+}$

$O_{2}$

$O_{2}^{2 -}$

$B_{2}$

answer is C.

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Detailed Solution

$O_{2}^{2 -}$

The molecular orbital diagram of $O_{2}^{2 -}$ ,π^∗2P_x and π^∗2P_y molecular orbitals are completely filled , which are partially filled in O₂.
There are no unpaired electrons.
So, $O_{2}^{2 -}$ does not contain unpaired electrons.

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