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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 `-0.44" V "` 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
(d) `X+Y^(2) to X^(2+)+Y`
For reaction to be spontaneous,`E^(@)` must be positive `E_(Zn^(2+)//Zn)^(@)+E_(Ni^(2+)//Ni)^(@)=0.76+(-0.23)=0.53` (positive).
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