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 :
In \[N{{O}_{2}}^{+}\] odd (unpaired) electron is removed. In peroxides \[({{O}_{2}}^{2-})\] no unpaired electrons are present as the anti bonding pi M.O. ?S acquired one more electron each for pairing \[AlO_{2}^{-}\]. containing \[A{{l}^{3+}}\]\[(2{{s}^{2}}{{p}^{6}})\]configuration and 2 oxides \[({{O}^{2-}})\] ions each of which does not contain unpaired electron. Superoxide \[{{O}^{2-}}\]has one unpaired electron in pi anti bonding M.O.
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