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The standard reduction potentials for Zn...

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+) rarr + Y` will be spontaneous when :

A

`X=Ni,Y=Fe`

B

`X=Ni,Y=Zn`

C

`X=Fe,Y=Zn`

D

`Z=Zn,Y=Ni`

Text Solution

Verified by Experts

The correct Answer is:
D
`X+Y^(2+)toX^(2+)+Y`
for reaction to be spontaneous `E^(@)` must be positive
`E_(Zn//Zn^(+2))^(@)+E_(Na^(2+)//Ni)^(@)=0.76+(-0.23)=+0.53` (positive)
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