NEET Chemistry Chemical Bonding and Molecular Structure / रासायनिक आबंधन एवं आणविक संरचना NEET PYQ-Chemical Bonding Molecular

  • question_answer
    The number of anti-bonding electrons in \[O_{2}^{2-}\] molecular ion on the basis of molecular orbital theory is (Atomic no. of O is 8):                                                                                                          [AIPMT 1998]

    A) 5         

    B)                   2

    C) 4         

    D)      6

    Correct Answer: D

    Solution :

    Total no. of electrons in \[O_{2}^{2-}=16+2=18\]
                According to MOT, the configuration of \[O_{2}^{2-}\] is
                \[\sigma \,1{{s}^{2}},\,\sigma \,*\,1{{s}^{2}},\,\sigma 2{{s}^{2}},\,\sigma *\,2{{s}^{2}},\sigma \,2p_{x}^{2},\,\pi 2p_{y}^{2}\]
                \[\pi \,2p_{z}^{2},\,\pi *\,\,2p_{y}^{1}\,\pi *\,\,2p_{z}^{1}\]
                Orbitals with represent and bonding M.O. so, the number of anti-bonding electrons = 6


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