Which of the following reactions are feasible, if the electrode potential areEoI2/I-=0.54 V,EoFe3+/Fe2+=0.77 V,EoAg+/Ag=0.8 V  and EoCu2+/Cu=0.34 V

For a reaction to be feasible, Eocell  must be positive andEosell =Eooxi+Eored or Eocell =Eocathode -Eoanode  (a) Fe3+(aq) and I-(aq)(a) Oxidation half-reaction2Γ(aq)⟶I2(s)+2e-;Eo=-0.54 VReduction half-reaction2Fe3+(aq)+2e-⟶2Fe2+(aq);  E°=+0.77 VOverall reaction,2Fe3+(aq)+2I(aq)⟶2Fe2+(aq)+I2(s)E°=+0.23 VPositive emf indicates that the reaction is feasible.(b) Oxidation half reaction,Cu(s)⟶Cu2+(aq)+2e-;E°=-0.34 VReduction half reaction,2Ag+(aq)+2e-⟶2Ag(s);E°=+0.80 VOverall reaction,Cu(s)+2Ag+(aq)⟶Cu2+(aq)+2Ag;E°=+0.46 VPositive emf indicates that the reaction is feasible.(c) Oxidation half-reaction,Cu(s)⟶Cu2+(aq)+2e-;E°=-0.34 VReduction half-reaction,Fe3+(aq)+e-⟶Fe2+(aq)×2;E°=+0.77 VOverall reaction,Cu(s)+2Fe3+(aq)⟶Cu2+(aq)+2Fe2+(aq)                                           E°=+0.43 VPositive emf indicates that the reaction is feasible.(d) Oxidation half-reaction,Ag(s)⟶Ag+(aq)+e-;E°=-0.80 VReduction half-reaction,Fe3+(aq)+e-⟶Fe2+(aq);  E°=+0.77 VOverall reaction,Ag(s)+Fe3+(aq)⟶Ag+(aq)+Fe2+(aq);E°=-0.03 VNegative emf indicates that the reaction is not feasible.