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E0 Value for Mn3+ Mn2+ Couple is Much More Positive than that for Cr3-/ Cr2-. - Chemistry

Sum

E0 value for  Mn3+ Mn2+ couple is much more positive than that for Cr3-/ Cr2-.

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Solution

Much larger 3rd ionisation energy of Mn (where the required change is d5 to d4) is mainly responsible for this. 
                       Mn3+ =

                       Mn2+ =   → Half filled (more stable)

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