1.

The standard reduction potentials 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+)toX^(2+)+Y will be spontaneous when

Answer»

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

SOLUTION :The reaction `X+Y^(2+)toX^(2+)+Y` will be SPONTANEOUS if `E_(CELL)^(@)` is +ve.
(a) `Zn+Ni^(2+)toZn^(2+)+Ni`,
`E_(cell)^(@)=E_(Ni^(2+)//Ni)^(@)-E_(Zn^(2+)//Zn)^(@)=-0.23-(-0.76)V`
(b) `Ni+Fe^(2+)toNi^(2+)+Fe,E_(cell)^(@)=E_(Fe^(2+)//Fe)^(@)-E_(Ni^(2+)//Ni)^(@)=-0.44-(-0.23)V`
`=-0.21V`
(c) `Ni+Zn^(2+)toNi^(2+)+Zn,E_(cell)^(@)=-0.53V` from (a)
(d) `Fe+Zn^(2+)toFe^(2+)+Zn,E_(cell)^(@)=E_(Zn^(2+)//Zn)^(@)=E_(Fe^(2+)//Fe)^(@)=-076-(-0.44)V=-0.32V`


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