Which one of the following is not paramagnetic?

N O

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N_{2}^{+}

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C O

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O_{2}^{-}

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Solution

The correct option is D $C O$
Paramagnetic character is shown by those atoms or molecules which have unpaired electrons.
In the given molecules $C O$ is not paramagnetic, since, it does not have unpaired electrons. The configuration of $C O$ molecule is
$C O (14) = σ 1 s^{2}, * σ 1 s^{2}, σ 2 s^{2}, * σ 2 s^{2}, π 2 p_{x}^{2} \approx π 2 p_{y}^{2}, σ 2 p_{z}^{2}$

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