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Given the standard potential of the foll...

Given the standard potential of the following at `25^(@)C`.
`MnO_(2) rarr Mn^(3+), " "lE^(c-)=0.95V`
`Mn^(3+) rarr Mn^(2+)," "E^(c-)=1.51V`
The standard potential of `MnO_(2)rarr Mn^(2+)` is

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