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Half cell reactions for some electrodes ...

Half cell reactions for some electrodes are given below
I. `A + e^(-) rarr A^(-) , E^(@) = 0.96V`
II. `B^(-) + e^(-) rarr B^(2-) , E^(@) = -0.12V`
III. `C^(+) + e^(-) rarr C, E^(@) =+0.18V`
IV. `D^(2+) + 2e^(-) rarr D, E^(@) = -1.12V`
Largest potential will be generated in which cell?

A

0.07V

B

0.77V

C

`0.77V`

D

`-0.07V`.

Text Solution

Verified by Experts

The correct Answer is:
B
The given electrode potentials are oxidation potentials . First of all they are dhanged to reduction potential
`E_("cell")^(@)=E_(c)^(@)-E_(a)^(@)`
`E_(B)^(@).^(+)._(//B)-E_(A)^(@).^(+)._(//A)`
`=0.42-(-0.35)=0.77V`
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