Four successive members of the first row transition elements are listed below with atomic numbers.Which one of them is expected to have the highest E0 M 3+ /M2+value? a)Cr b)Mn c)Fe d)Co

Electronic configuration of the elements are :Cr3+         3d3 4s0Mn3+        3d4 4s0Fe3+         3d5 4s0Co3+         3d6 4s0The main criteria to determine the reduction potential is by its third ionisation enthalpy.The third ionisation enthalpy of Co3+ is highest due to greatest effective nuclear charge, hence it is difficult to form Co3+ to Co2+ and its reduction potential is highest.Hence, correct answer is (d)

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d
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b.
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