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JIPMER Jipmer Medical Solved Paper-2005

  • question_answer
    In \[{{[NiC{{l}_{4}}]}^{2-}},\] the number of unpaired electrons, are:

    A)  4                            

    B)         2                            

    C)  3                            

    D)         5

    Correct Answer: C

    Solution :

    In \[{{[NiC{{l}_{4}}]}^{2-}}\] the oxidation number of Ni is +2. Electronic configuration of Ni (at no. = 28) \[Ni=[Ar]\,3{{d}^{8}}4{{s}^{2}}\] \[N{{i}^{+2}}=[Ar]\,3{{d}^{8}}\] or            \[[Ar]\,\,\,\,\,\] It is evident that in \[{{[NiC{{l}_{4}}]}^{2-}}\] the number of unpaired electrons are two.


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