Which of the following is/ are not paramagnetic?

N O

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B r_{2}

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C O

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O_{2}

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Solution

The correct options are
B $B r_{2}$
C $C O$
Paramagnetism is a result of unpaired electron.
$⟶$ $N O$ has one unpaired electron.
$⟶$ Dioxygen $(O_{2})$ has 2 unpaired electron with parallel spins.
$⟶$ ${B r}_{2}$ and $C O$ do not have unpaired electron.
$B r = 7$ valence electrons ${(4 s}^{2} {4 p}^{5})$
${B r}_{2} = 7 \times 2 = 14 e^{-}$

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