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Given that the standard reduction potent...

Given that the standard reduction potentials `E ^(0) of Fe^(+2)|Feis 0.26V and Fe ^(+3) |Fe is 0.76V` respectively. The `E ^(@)of Fe ^(+2)|Fe^(+3)` is:

A

`+1.76V`

B

`-1.76V`

C

`+0.182V`

D

`-0.182V`

Text Solution

Verified by Experts

The correct Answer is:
B
`Fe ^(+2) + 2e ^(-) to Fe DeltaG_(1) ^(0) =-2F xx0.26 " "…(i)`
`Fe ^(+2) to Fe ^(+3) to Fe Delta G _(2)^(0) =-3F xx0.76" "…(ii)`
`Fe^(+2) to Fe ^(+3) + e ^(-) Delta G _(3)^(0) =-1Fxx E _(3)^(0) " "…(iii)`
+ equation (i)- equation (2) = equation (3)
`Delta G _(1) ^(@) - Delta G_(2)^(@)=Delta G _(3)^(@), - 0.522F + 2.23F =-F xxE_(3)^(@)`
`1.76 =-E _(3 )^(@), " "E_(3) ^(@) =-1.76V`
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