A) contains unpaired electrons
B) contains zero charge
C) contains paired electrons only
D) contains a double bond
Correct Answer: A
Solution :
Oxygen molecule contains 16 electrons. Its molecular orbital configuration is: \[\sigma 1{{s}^{2}},\sigma {{1}^{*}}{{s}^{2}},\sigma 2{{s}^{2}},{{\sigma }^{*}}2{{s}^{2}},\sigma 2p{{x}^{2}},\] \[\pi 2p_{y}^{2},\pi p_{z}^{2},\pi 2{{p}^{*}}{{y}^{1}},\pi {{2}^{*}}p_{z}^{1}\] The molecular orbital configuration of\[{{\text{O}}_{\text{2}}}\] molecule contains 2 unpaired electron. Therefore, it is paramagnetic in nature.
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