See explanation below.
Work Step by Step
Mn2+(aq) + 2 H2O(l) + 2 Co3+(aq) → MnO2(s) + 4 H+(aq) + 2 Co2+(aq) E cell = E°Co3+ - E°MnO2 = 1.82 V - (1.23 V) = 0.59 V Reaction is spontaneous, as E cell is positive
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