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Two half reactions in electochemical cel...

Two half reactions in electochemical cell are given below:
`MnO_4^-(aq)+8H^(+)(aq)+5barerarrMn^(2+)(aq)+4H_2O(l)`,
`sn^(2+)(aq)rarrSn^(4+)(aq)+2bare`,
Construct the redox reaction equation form the two Half-reactions and calculate the cell potential from the standard potentials and predict the reaction is reactant or product favoured.

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