Standard reduction potential of `Zn^(2+)//Zn,Ni^(2+)//Ni` and `Fe^(2+)//Fe` are -0.76 V, -0.23 V and -0.44 V respectively. So in which condition reaction `X+Y^(2+) to Y+X^(2+)` would be spontaneous ?

Options

A. `X=Ni,Y=Fe`
B. `X=Ni,Y=Zn`
C. `X=Fe,Y=Zn`
D. `X=Zn,Y=Ni`

Answer

D

Explanation

`Zn_((S))+Ni_((aq))^(2+) to Zn_(Ni^(2+)//Ni)^(@)-E_(Zn^(2+)//Zn)^(@)`
`=-0.23-(-0.76)=+0.52V`.