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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+) rarrX^(2+)+y`
will be spontaneous when :

A

X= Ni,Y=Fe

B

X=Ni,Y=Zn

C

X = Fe,Y = Zn

D

X = Zn,Y=Ni

Text Solution

Verified by Experts

The correct Answer is:
D
For spontaneous process `E^(@)=E_("reduced species")^(@)` should positive
`E^(@)=E^(@)-E_(za^(2+)//Za)^(@)=-0.23 -(0.76)=+0.53 V`
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