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Consider the following E^(@) values E^(@...

Consider the following `E^(@)` values `E^(@)` values `E_(Fe^(3+)//Fe^(2+))^(@)= 0.77v` , `E_(Sn^(2+)//Sn)^(@) = -0.14` under standard condition the potential for the reaction `Sn_(s)+ 2Fe^(3+)(aq)rightarrow 2Fe^(2+)(aq) + 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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