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 when

Answer»

`X=Ni,Y=Fe`
`X=Ni,Y=Zn`
`X=Fe,Y=Zn`
`X=Zn,Y=Ni`

SOLUTION :`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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