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E(Fe^(3+)//Fe)^(@)=-0.036V,E(Fe^(2+)//Fe...

`E_(Fe^(3+)//Fe)^(@)=-0.036V,E_(Fe^(2+)//Fe)^(@)=-0.0439V`. The value of standard electrode potential for the change, `Fe^(3+)(aq)+e^(-)toFe^(2+)(aq)` will be

A

`-0.072V`

B

`-0.385V`

C

`-0.020V`

D

`-0.270V`

Text Solution

Verified by Experts

The correct Answer is:
C
We use the equations,
`DeltaG^(@)=-nFE^(@)`
Since, `DeltaG_(3)=DeltaG_(1)-DeltaG_(2)`
`=-n_(1)FE_(1)-(-n_(2)FE_(2))`
`=3xxFxx(-0.036v)+2xxFxx(-0.0439V)`
`=+0.108F-0.0878F` ltBrgt `=0.0202F`
`DeltaG_(3)=-nFE^(@)=-1xxFxxE^(@)`
`E^(@)=(-0.0202F)/(F)`
`=-0.0202V`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-PRACTICE SET 03-PAPER 1 (PYSICS & CHEMISTRY)
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