Question

If `E_(Fe^(3+)//Fe)^(@)` and `E_(Fe^(2+)//Fe)^(@)` are `-0.36 V` and `0.439 V` respectively, then value of `E_(Fe^(3+)//Fe^(2+))^(@)` is
A. `(-0.036-0.439) V`
B. `[3(-0.36)+2(0.439)] V`
C. `(-0.36-0.439)] V`
D. `[(3-0.36)-2(-0.439)]V`

Answer 1

Correct Answer - D
`E_(Fe^(3)//Fe^(2+))^(@)=3E_(Fe^(3+)//Fe)^(@)-2E_(Fe^(2+)//Fe)^(@)`
`=[(3-0.36)-2(-0.439)]V`