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4.Chemical Bonding and Molecular Structure
easy
The bond order and magnetic behaviour of $\mathrm{O}_{2}^{-}$ion are, respectively:
A
$1.5$ and paramagnetic
B
$1.5$ and diamagnetic
C
$2$ and diamagnetic
D
$1$ and paramagnetic
(JEE MAIN-2021)
Solution
$\mathrm{O}_{2}^{-}=\left(\sigma_{1 \mathrm{~s}}\right)^{2}\left(\sigma_{1 \mathrm{~s}}^{*}\right)^{2}\left(\sigma_{2 \mathrm{~s}}\right)^{2}\left(\sigma_{2 \mathrm{~s}}^{*}\right)^{2}\left(\sigma_{2 \mathrm{p}_{\mathrm{z}}}\right)^{2}$
$\left(\pi_{2 \mathrm{p}_{\mathrm{x}}}^{2}=\pi_{2 \mathrm{p}_{\mathrm{y}}}^{2}\right)\left(\pi_{2 \mathrm{p}_{\mathrm{x}}}^{*_{2}}=\pi_{2 \mathrm{p}_{\mathrm{y}}}^{*_{1}}\right)$
$\text { Bond order }=\frac{10-7}{2}=1.5$
and paramagnetic
Standard 11
Chemistry
