A) \[NO_{2}^{+}\] and \[Ba{{O}_{2}}\]
B) \[K{{O}_{2}}\]and\[AlO_{2}^{-}\]
C) \[K{{O}_{2}}\] only
D) \[Ba{{O}_{2}}\]only
Correct Answer: C
Solution :
Unpaired electrons are present in \[K{{O}_{2}}\] while others have paired electron \[NO_{2}^{+}\]= 22 electrons ; \[Ba{{O}_{2}}\]= 72 electrons \[Al{{O}_{2}}=30\]electrons ; \[K{{O}_{2}}=35\] electrons
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