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JEE Main & Advanced Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank General Characteristics

  • question_answer
    Which of the following ions has the least magnetic moment [MP PMT 1993]

    A) \[C{{u}^{+2}}\]

    B) \[N{{i}^{+2}}\]

    C) \[C{{o}^{+3}}\]

    D) \[F{{e}^{+2}}\]

    Correct Answer: A

    Solution :

     \[C{{u}^{+2}}\]
    S.No Ion Electronic configuration No. of unpaired electrons
    (i) \[C{{u}^{+2}}\] \[{{d}^{9}}\] 1
    (ii) \[N{{i}^{+2}}\] \[{{d}^{8}}\] 2
    (iii) \[C{{o}^{+2}}\] \[{{d}^{7}}\] 3
    (iv) \[F{{e}^{+2}}\] \[{{d}^{6}}\] 4
    \[\mu =\sqrt{n(n+2)}\] (magnetic moment) \[\mu \propto \sqrt{n}\] \[C{{u}^{+2}}\] there is only 1 unpaired electron so its magnetic moment is least.


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