During change of $O_{2}$ to $O_{2}^{-}$ ion, the electron adds on which one of the following orbitals?

π

orbital

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σ^{*}

orbital

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σ

orbital

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π^{*}

orbital

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Solution

The correct option is D $π^{}$ orbital
During change of $O_{2}$ to $O_{2}^{-}$ ion, the electron adds on $π^{}$ orbital.
The configuration of $O_{2}$ is
$K K σ {(2 s)}^{2} σ^{} {(2 s)}^{2} σ {(2 p z)}^{2} π {(2 p x)}^{2} π {(2 p y)}^{2} π^{} {(2 p x)}^{1} π^{} {(2 p y)}^{1}$
The configuration of $O_{2}^{-}$ is

$K K σ {(2 s)}^{2} σ^{} {(2 s)}^{2} σ {(2 p z)}^{2} π {(2 p x)}^{2} π {(2 p y)}^{2} π^{} {(2 p x)}^{2} π^{} {(2 p y)}^{1}$

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