If `E_(A^(+2)//A)^(@)=-0.30 V and E_(A^(+3)//A^(+2))^(@)=0.40 V,` the standard Emf of the reaction: `A+2A^(+3)to3A^(+2)` will be :-

If e_(Fe^(2+) //Fe)^@ =- 0. 44 1V . And E_(Fe^(3+)//Fe^(2+))^(o) = 0. 771 V . The standard emf of the reaction Fe +2 Fe^(3+) rarr 3Fe^(2+) will be .

If E_(Fe^(2+))^(@)//Fe = -0.441 V and E_(Fe^(3+))^(@)//Fe^(2+) = -0.771 V The standard EMF of the reaction Fe+2Fe^(3+) rarr 3Fe^(2+) will be:

If E_(Fe^(2+))^(@)//Fe = -0.441 V and E_(Fe^(3+))^(@)//Fe^(2+) = 0.771 V The standard EMF of the reaction Fe+2Fe^(3+) rarr 3Fe^(2+) will be:

If E_(Fe^(2+)//Fe)^(@)=-0.440 V and E_(Fe^(3+)//Fe^(2+))^(@)=0.770 V , then E_(Fe^(3+)//Fe)^(@) is -

If E ^(@) (Fe ^(2+)|Fe)=-0.441 V and E ^(@) (Fe ^(3+) |Fe ^(2+))=0.77 1V, the standard E.M.F. of the reaction : Fe + 2F e ^(3+) to 2F e ^(2+) will be