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The number of antibonding electron pairs in $\mathrm{O}_{2}^{2-}$ molecular ion on the basis of molecular orbital theory is (Atomic number of $\mathrm{O}$ is 18 )
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The correct answer is:
4
The electronic configuration of $\mathrm{O}_{2}^{2-}$ ion is
$$
\begin{aligned}
&\mathrm{O}_{2}^{2-}-\sigma 1 s^{2}, \sigma^{*} 1 s^{2}, \sigma 2 s^{2}, \dot{\sigma} 2 s^{2}, \sigma 2 p_{z}^{2}, \sigma 2 p_{x}^{2}, \\
&\pi 2 p_{y}^{2}, \pi 2 p_{x}^{2}, \pi 2 p_{y}^{2}
\end{aligned}
$$
Hence, number of antibonding electron pairs in $\mathrm{O}_{2}^{2-}$ molecular ion are four.
$$
\begin{aligned}
&\mathrm{O}_{2}^{2-}-\sigma 1 s^{2}, \sigma^{*} 1 s^{2}, \sigma 2 s^{2}, \dot{\sigma} 2 s^{2}, \sigma 2 p_{z}^{2}, \sigma 2 p_{x}^{2}, \\
&\pi 2 p_{y}^{2}, \pi 2 p_{x}^{2}, \pi 2 p_{y}^{2}
\end{aligned}
$$
Hence, number of antibonding electron pairs in $\mathrm{O}_{2}^{2-}$ molecular ion are four.
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