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JEE Main & Advanced Sample Paper JEE Main Sample Paper-21

  • question_answer
    The correct order of \[E_{{{M}^{2+}}/M}^{o}\] values with negative sign for the four successive elements Cr, Mn, Fe and Co is

    A)  \[Mn>Cr>Fe>Co\]

    B)  \[Cr>Fe>Mn>Co\]

    C)  \[Fe>Mn>Cr>Co\]

    D)  \[Cr>Mn>Fe>Co\]

    Correct Answer: A

    Solution :

    Generally across the first transition series, the negative values for standard electrode potential decrease (exception Mn- due to stable d5 configuration) Standard electrode potential -
    Mn Cr Fe Co
    \[{{M}^{2+}}/M\] -1.18 -0.90 -0.44 -0.28 eV
    So, correct order is Mn > Cr > Fe > Co.             


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