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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2010

  • question_answer
    The spin only magnetic moment of \[M{{n}^{4+}}\] ion is nearly

    A) 3 BM                                     

    B) 6 BM

    C) 4 BM                                     

    D) 5 BM

    Correct Answer: C

    Solution :

    The electronic configuration of Mn is                 \[_{25}Mn=[Ar]\,3{{d}^{5}}4{{s}^{2}}\]                 \[M{{n}^{4+}}=[Ar]\,3{{d}^{3}}\] Thus, three unpaired electrons are present. \[\therefore \] Spin only magnetic moment,\[\mu =\sqrt{n(n+2)}\] \[\therefore \]                                  \[n=3\] \[\therefore \]                                  \[\mu =\sqrt{3(3+2)}\]                                                 \[=\sqrt{15}=3.87\]                                                 = 4 BM


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