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Which of the following species exhibits the diamagnetic behaviour?

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a

O_{2}^{2 -}

b

O_{2}^{+}

c

O_{2}

d

NO

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detailed solution

Correct option is A

The electronic configuration of given species are as follows:

$\begin{array}{ll} O_{2}^{2 -}; (σ 2 s)^{2} {(σ^{*} 2 s)}^{2} {(σ 2 p_{z})}^{2} {(π 2 p_{x})}^{2} {(π 2 p_{y})}^{2} {(π^{*} 2 p_{x})}^{2} {(π^{*} 2 p_{y})}^{2} \\ O_{2}^{+} and NO (σ 2 s)^{2} {(σ^{*} 2 s)}^{2} {(σ 2 p_{z})}^{2} {(π 2 p_{x})}^{2} {(π 2 p_{y})}^{2} {(π^{*} 2 p_{x})}^{1} \\ O_{2}; (σ 2 s)^{2} {(σ^{*} 2 s)}^{2} {(σ 2 p_{z})}^{2} {(π 2 p_{x})}^{2} {(π 2 p_{y})}^{2} {(π^{*} 2 p_{x})}^{1} {(π^{*} 2 p_{y})}^{1} \end{array}$

Hence, $O_{2}^{2 -}$ is diamagnetic as it does not contain unpaired electron.

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