According to molecular orbital theory, the number of unpaired electron(s) in $\mathrm{O}_{2}^{2-}$ is :
According to molecular orbital theory, the number of unpaired electron(s) in $\mathrm{O}_{2}^{2-}$ is :
- [JEE MAIN 2021]
- A
$1$
- B
$0$
- C
$2$
- D
$3$
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- [JEE MAIN 2014]