A) 5
B) 4
C) 3
D) 2
Correct Answer: B
Solution :
The electronic configuration of \[O_{2}^{2-}\] ion is \[O_{2}^{2-}-\sigma 1{{s}^{2}},\overset{*}{\mathop{\sigma }}\,1{{s}^{2}},\sigma 2{{s}^{2}},\overset{*}{\mathop{\sigma }}\,2{{s}^{2}},\sigma 2p_{z}^{2},\pi 2p_{x}^{2},\]\[\pi 2p_{z}^{2},\overset{*}{\mathop{\pi }}\,2p_{x}^{2},\overset{*}{\mathop{\pi }}\,2p_{y}^{2}\] Hence, number of anti bonding electron pairs in \[O_{2}^{2-}\] molecular ion are four.
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