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The standard electrode potentials (reduc...

The standard electrode potentials (reduction) of `Pt//Fe^(3+),Fe^(+2)` and `Pt//Sn^(4+),Sn^(+2)` are `+0.77V` and `0.15V` respectively at `25^(@)C`. The standard `EMF` of the reaction `Sn^(4+) +2Fe^(2+) rarr Sn^(2+) +2Fe^(3+)` is

A

`-0.62V`

B

`-0.92V`

C

`+0.31V`

D

`+0.85V`

Text Solution

Verified by Experts

The correct Answer is:
A
`2Fe^(2+) +Sn^(+4) rarr 2Fe^(+3) +Sn^(+3)`
`E^(@) = E_(C)^(@) - E_(A)^(@) = 0.15 - 0.77 =- 0.62V`
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