1.

MnO_(4)^(-) +8H^++5e^-to Mn^(2+) +4H_2 O ,E^@ = 1.51 V MnO_(4)^(-) +4H^++2e^-to Mn^(2+) +2H_2 O ,E^@ = 1.23 VE_(MnO_(4)^(-) "|" MnO_(2))is

Answer»

`1.70 v`
`0.91 V`
`1.37 V`
`0.548 V`

Solution :`MnO_(4)^(- )+ 8H^( +) + 5e^(- )to MN^(2+)+ 4 H_2O ,E^@= 1.51V `
` DeltaG_(1)^(@)=- 5 ( 1.51 )F=- 7.55F `
`MnO_2+4H^( +) +2e^(-) toMn^(2+) +2 H_2 O ,E^@= 1.23V `
`DeltaG_(2)^(@)=- 2(1.23 )F= - 2.46F `
onsubtracting
`MnO_(4)^@=- 5 ( 1.51) F = - 7.55F `
`E_("MnO_(4)^(-) |MnO_2 ) ^@ = (DeltaG_(3) ^(@) )/(-nF) =(-5.09 F)/(-3F) = 1.70V `


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