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  4. The bond order and magnetic behaviour of O 2-ion are, respectively:

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Q. The bond order and magnetic behaviour of $O _{2}^{-}$ion are, respectively:

JEE MainJEE Main 2021Chemical Bonding and Molecular Structure

Solution:

$O _{2}^{-}=\left(\sigma_{1 s }\right)^{2}\left(\sigma_{1 s }^{*}\right)^{2}\left(\sigma_{2 s }\right)^{2}\left(\sigma_{2 s }^{*}\right)^{2}\left(\sigma_{2 p _{z}}\right)^{2}$
$\left(\pi_{2 p _{ x }}^{2}=\pi_{2 p _{ y }}^{2}\right)\left(\pi_{2 p _{ s }}^{* 2}=\pi_{2 py }^{* 1}\right)$
Bond order $=\frac{10-7}{2}=1.5$
and paramagnetic