A) \[2\]
B) \[3\]
C) \[4\]
D) \[5\]
Correct Answer: C
Solution :
The number of electrons in \[O_{2}^{2-}\] molecular ion is 18. Hence, the electronic configuration of \[O_{2}^{2-}\] ion will be \[K{{K}^{+}},\,\,\sigma 2{{s}^{2}},{{\sigma }^{*}}2{{s}^{2}},2p_{z}^{2},\pi 2p_{x}^{2}\] \[\approx \pi 2p_{y}^{2},{{\pi }^{*}}2p_{x}^{2}\] \[\approx {{\pi }^{*}}2p_{y}^{2},\,{{\sigma }^{*}}2p_{z}^{0}\] Hence, the number of anti bonding electron pairs (*) in \[O_{2}^{2-}\]ion is 4.
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