JEE Main & Advanced Sample Paper JEE Main Sample Paper-38

  • question_answer Among \[K{{O}_{2}},AlO_{2}^{-},\,Ba{{O}_{2}}\] and \[NO_{2}^{+},\] unpaired electron is present in

    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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