The standard reduction potentials for `Zn^(2+)//Zn,Ni^(2+) and Fe^(2+)//Fe` are -0.76,-0.23 and -0.44V respectively. The reaction `X+Y^(2+)toX^(2+)+Y` will be spontaneous whenA. `X=Ni,Y=Fe`B. `X=Ni,Y=Zn`C. `X=Fe,Y=Zn`D. `X=Zn,Y=Ni`

The standard reduction potentials for `Zn^(2+)//Zn,Ni^(2+) and Fe^(2+)

1.	The standard reduction potentials for `Zn^(2+)//Zn,Ni^(2+) and Fe^(2+)//Fe` are -0.76,-0.23 and -0.44V respectively. The reaction `X+Y^(2+)toX^(2+)+Y` will be spontaneous whenA. `X=Ni,Y=Fe`B. `X=Ni,Y=Zn`C. `X=Fe,Y=Zn`D. `X=Zn,Y=Ni`
Answer» Correct Answer - 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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