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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 have more negative `DeltaG` value when X and Y are

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`
`DeltaG=-nFE_(cell)`.
Greater the value of `E_(cell)`.more will be the value of `DeltaG`. For this, the difference between `E^(@)` values of `X^(2+)` and `Y^(2+)` must be maximum. This means that X=Zn and Y=Ni.
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