$\mu = \sqrt{15}$ is true for the pair :-

  • A

    $Co^{+2}, Cr^{+3}$

  • B

    $Fe^{+2}, Cr^{+3}$

  • C

    $Fe^{+3}, Fe^{+2}$

  • D

    $Mn^{+2} , Fe^{+2}$

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