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(D) The standard electrode potential $E^{o}_{M^{3+} / M^{2+}}$ depends on the stability of the $M^{3+}$ and $M^{2+}$ oxidation states.The values for t

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$Co$ $(Z=27)$

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(D) The standard electrode potential $E^{o}_{M^{3+} / M^{2+}}$ depends on the stability of the $M^{3+}$ and $M^{2+}$ oxidation states.The values for the given elements are:$Cr^{3+} / Cr^{2+} = -0.41 \ V$$Mn^{3+} / Mn^{2+} = +1.57 \ V$$Fe^{3+} / Fe^{2+} = +0.77 \ V$$Co^{3+} / Co^{2+} = +1.97 \ V$Comparing these values,$Co^{3+} / Co^{2+}$ has the highest positive value of $+1.97 \ V$,indicating that $Co^{3+}$ is the most easily reduced to $Co^{2+}$ among the given elements.

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest $E^{o}_{M^{3+} / M^{2+}}$ value?

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