A) \[{{O}_{2}}\]
B) \[O_{2}^{2+}\]
C) \[O_{2}^{2-}\]
D) \[O_{2}^{-}\]
Correct Answer: C
Solution :
Species with unpaired electrons is paramagnetic \[{{O}_{2}}\] has 2 unpaired electrons, \[O_{2}^{-}\] has one unpaired, \[O_{2}^{2-}\] has zero unpaired electrons, \[O_{2}^{2+}\] has one unpaired.
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