Which of the following species has unpaired electrons?

N_{2}

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F_{2}

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O_{2}^{-}

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O_{2}^{2 -}

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Solution

The correct option is B $O_{2}^{-}$
For $O_{2}^{-}$ ,

$O_{2}^{-} : (σ 1 s^{2}) (σ * 1 s^{2}) (σ 2 s^{2}) (σ * 2 s^{2}) (σ 2 p_{z}^{2}) (π 2 p_{x}^{2} = π 2 p_{y}^{2}) (π * 2 p_{x}^{2} = π * 2 p_{y}^{1})$

So, $O_{2}^{-}$ has 1 unpaired electrons.

The correct option is [C]

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Similar questions

Question 28

Diamagnetic species are those which contain no unpaired electrons. Which among the following are diamagnetic?

(a) $N_{2}$

(b) $N_{2}^{2 -}$

(d) $O_{2}^{2 -}$

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