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Celll equation : A = 2B^(+) rarr A^(2+) ...

Celll equation : `A = 2B^(+) rarr A^(2+) + 2 B`
`A^(2+) + 2e rarr A`
`E^@ = + 0.34 V` and `log_(10) K= 15. 6 ` at `300 K` for cell reactions Find `E^@` for `B^(+) +e rarr B`
Given `[( 2.303 RT)/(nF) =0.059]` at `300 K`.

A

`0.81" V "`

B

`1.26" V "`

C

`-0.54" V "`

D

`+0.94" V "`

Text Solution

Verified by Experts

The correct Answer is:
A
(a) `E_(cell)^(@)=(0.059)/(2)"log"K`.
`E_(B^(+)//B)^(@)-E_(A^(+)//A)^(@)=(0.059)/(2)log K`.
`E_(B^(+)//B)^(@)-0.34" V"=(0.059)/(2)log 15.6`
`=(0.059)/(2)xx1.193`
`E_(B^(+)//B)^(@)=0.46+0.35=0.81" V "`
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