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Consider the following E^o values : E...

Consider the following `E^o` values :
`E^o _Fe^(3+)//FE^(2+)o = + 0.77 V`
`E_(Sn^(2+)//Sn) =- 0.14 V`
Under standard conditions the potential for reaction
`Sn(s) +2Fe^(3+) (aq) rarr 2Fe^(2+) (sq) + Sn^(2+) (aq)` is.

A

`0.91V`

B

`1.40V`

C

`1.68V`

D

`0.63V`

Text Solution

Verified by Experts

The correct Answer is:
A
`Sn -2e rarr Sn^(2+)`
`(2Fe^(3+)+2e rarr 2Fe^(2+))/(Sn+2Fe^(3+) rarr Sn^(2+) +2Fe^(2+))`
`E^(@)cell = (E_(C)^(@) -E_(A)^(@))_(R)`
`=0.77V +0.14V = 0.91V`
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