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The standard reduction potentials for Zn...

The standard reduction potentials 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+)to X^(2)+Y` will be spontaneous when :

A

`X=Ni,Y=Fe`

B

`X=Ni,Y=Zn`

C

`X=Fe,Y=Zn`

D

`X=Zn,Y=Ni`

Text Solution

Verified by Experts

The correct Answer is:
D
`X+Y^(2+)toX^(2+)+Y`
for reaction to be spontaneous `E^(o)` must be positive
`underset(("Positive"))(E_(zn//zn^(+2))^(o)+E_(Ni^(2+)//Ni)^(o)=0.76+(-0.23)=+0.53)`
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