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RAJASTHAN ­ PET Rajasthan PET Solved Paper-2009

  • question_answer
    For which of the following metals, the electronic configuration of valence shell is not \[{{d}^{6}}\]?

    A)  Fe (II)              

    B) \[Mn\](II)

    C)  Co (III)             

    D)  Ni (IV)

    Correct Answer: B

    Solution :

     [a] \[Fe=[Ar]3{{d}^{6}},4{{s}^{2}}\] \[F{{e}^{2+}}=[Ar]3{{d}^{6}}\] [b] \[Mn=[Ar]3{{d}^{5}},4{{s}^{2}}\] \[M{{n}^{2+}}=[Ar]3{{d}^{5}}\] [c] \[Co=[Ar]3{{d}^{7}},4{{s}^{2}}\] \[C{{o}^{3+}}=[Ar]3{{d}^{6}}\] [b] \[Ni=[Ar]3{{d}^{8}},4{{s}^{2}}\] \[N{{i}^{4+}}=[Ar]3{{d}^{6}}\] Therefore, the valence shell electronic configuration of\[Mn\](II) is not\[{{d}^{6}}\].


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