MCQ
Which of the following species exhibits the diamagnetic behaviour ?
- A$NO$
- ✓$O_2^{2-}$
- C$O_2^+$
- D$O_2$
✓
Answer
Correct option: B.
$O_2^{2-}$
b
$\quad O_{2}^{2}$ has $18$ electrons.
$\quad O_{2}^{2}$ has $18$ electrons.
Moleculer orbital configuration of $O_{2}^{2-}$ is
$\sigma_{1 s^{2}} \sigma_{1 s^{2}}^{*} \sigma_{2 s^{2}} \sigma_{2 s^{2}}^{*} \sigma_{2 p_{z}^{2}} \pi_{2 p_{*}^{2}}$$=\pi_{2 p_{y}^{2}} \pi_{2 p_{z}^{2}}^{*}$$=\pi_{2 p_{y}^{2}}^{*}=\pi_{2 p_{y}^{2}}^{*}$
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