`FeO_4^(2-) overset(+2.2V)to Fe^(3+) overset(+0.70V)to Fe^(2+) overset(-0.45V)to Fe^(0)`
`E_((FeO_4)^(2-)//Fe^(2+))^(theta)` is `x xx 10^-3V`.The value of `x` is ______

e.m.f. diagram for some ions is given as : FeO_(4)^(2-)overset(E^(@)=+2.20V)rarrFe^(3+)overset(E^(@)=+0.77V)rarrFe^(2+)overset(E^(@)=-0.445V)(rarr)Fe^(0) Datermine the value of E_(FeO_(4)^(2-)//Fe^(2+))^(@) .

Given the standard oxidation potentials Fe overset(+0.4V)rarr Fe^(2+) (aq.) overset(-0.8V)rarr Fe^(3+) (aq.) Fe overset(+0.9V)rarr Fe(OH)_(2) overset(0.6V)rarr Fe(OH)_(3) It is easier to oxidise Fe^(2+) " to " Fe^(3+)in

Consider the cell at 25^(@) C Zn | Zn^(2+) (aq), , (1 M) || Fe^(3+) (aq) , Fe^(2+) (aq) | Pt(s) The fraction of total iron present as Fe^(3+) ion at the cell potential of 1 . 5000 V is x xx 10 ^(-2) . The value of x is ________ (Nearest integer) (Given : E_(Fe^(3+)//Fe^(2+))^(0) = 0 . 77 V, E_(Zn^(2+)//Zn)^(0) = - 0 . 76 V

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