Why is the `E^(⊖)` value for the `Mn^(3+)//Mn^(2+)` couple much more positive than that for `Cr^(3+//Cr^(2+)` or `Fe^(

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Q 3011401320.     Why is the `E^(⊖)` value for the `Mn^(3+)//Mn^(2+)` couple much more positive than that for `Cr^(3+//Cr^(2+)` or `Fe^(3+)//Fe^(2+)?` Explain.

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