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J & K CET Engineering J and K - CET Engineering Solved Paper-2012

  • question_answer
    The spin only magnetic moment of \[{{[Cr{{F}_{6}}]}^{4-}}\] (at. no. for Cr is 24) is

    A)  0              

    B)  1.7 3BM

    C)  2.83 BM       

    D)    4.9 BM

    Correct Answer: D

    Solution :

     The spin only magnetic moment of\[{{[Cr{{F}_{6}}]}^{4-}}\] \[x-6=-4\] \[x=+\,2\] \[Cr(+2)=[Ar]\,\,3{{d}^{4}}\] \[n=4\](number of unpaired electrons) Magnetic moment \[=\sqrt{n(n+2)}=\sqrt{4(4+2)}\] \[=\sqrt{24}\] \[=4.9\,BM\]


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