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If E(Fe^(3+)//Fe)^(@) and E(Fe^(2+)//Fe)...

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

`(-0.36-0.439)V`

B

`(-0.36+0.439)V`

C

`[3(-0.36)+2(-0.439)]V`

D

`[3(-0.36)-2(-0.439)]V`

Text Solution

Verified by Experts

The correct Answer is:
4
`nFE_(Fe^(3+)//Fe)^(@)=nEF_(Fe^(3+)//Fe^(2+))^(@)+nEF_(Fe^(2+)//Fe)^(@)`
`3xx(-0.36)=1xxE_(Fe^(3+)//Fe^(2+))^(@)+2xx(-0.439)`
`E_(Fe^(3+)//Fe^(2+))^(@)=3(-3.6)-2xx(-0.439)`
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