Which of the following are paramagnetic?

B_{2}

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O_{2}

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N_{2}

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H e_{2}

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Solution

The correct options are
A $B_{2}$
B $O_{2}$
From MOT diagram it can be seen that $B_{2}$ and $O_{2}$ have unpaired electron so they are paramagnetic but $N_{2}$ and $H e_{2}$ are diamagnetic due to absence of unpaired electron.

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