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AMU Medical AMU Solved Paper-2002

  • question_answer
    The highest magnetic moment will be shown by

    A)  Ni                                          

    B)  Co

    C)  Fe                                         

    D)  Zn

    Correct Answer: C

    Solution :

                     Key Idea The magnetic moment is given as\[\mu =\sqrt{n\,(n+2)}\]where n is number of unpaired electrons. So, magnetic moment depends upon the number of unpaired electrons.
    Ni(28) [Ar] \[3{{d}^{8}}4{{s}^{2}}\] 2 unpaired electrons
    Co(27) [Ar] \[3{{d}^{7}}4{{s}^{2}}\] 3 unpaired electrons
    Fe(26) [Ar] \[3{{d}^{6}}4{{s}^{2}}\] 4 unpaired electrons
    Zn(30) [Ar] \[3{{d}^{10}}4{{s}^{2}}\] No unpaired electrons.
                                                    Since, Fe has maximum number of unpaired electrons among these. So, it will has highest magnetic moment.


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