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If E(Fe^(2+)//Fe)^(@)=-0.440 V and E(Fe^...

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

A

0.330 V

B

`-0.037 V`

C

`-0.330 V`

D

`-1.210 V`

Text Solution

Verified by Experts

The correct Answer is:
B
`{:(Fe^(+3)//Fe,),(Fe^(+2)+2e^(-) rarr Fe,E^(@)=-0.44),(Fe^(+3)+e^(-) rarr Fe^(+2),E^(@)=0.770),(ulbar(Fe^(+3)+3e^(-) rarr Fe),E^(@)=?):}`
`E^(@)=(n_(1)E_(1)^(@)+n_(2)E_(2)^(@))/n_(3)=(2(-0.44)+1xx(0.770))/(3)=(-0.88+0.770)/(3)=-0.037` volt
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