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The standard reduction potential for Zn^...

The standard reduction potential for `Zn^(2+)//Zn, Ni^(2+)//Ni`, and `Fe^(2+)//Fe` are `-0.76, -0.23` and `-0.44V` respectively. The reaction `X+Y^(2+) rarr X^(2+)+Y` will be spontaneous when :

A

`X=Zn, Y=Ni`

B

`X=Ni, Y=Fe`

C

`X=Ni, Y=Zn`

D

`X=Fe, Y=Zn`

Text Solution

Verified by Experts

The correct Answer is:
A
For the reaction to be spontaneous, `E^(@)` must be positive.
`Zn+Ni^(2+) rarr Zn^(2+) +Ni`
`E=E_(Ni^(2+)//Ni)^(@)-E_(Zn^(2+)//Zn)^(@)`
`=-0.23-(-0.76)`
`=0.53V`
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