The standar reduction potentials of `Zn^(2+)|Zn,Cu^(2+)||Cu^(2+)|Cu| Zn |Zn^(2+)||Ag^(+)|AgIIICu|Cu^(2+)||Ag^(+)|Ag`
What is the correct order of `E_(cell)^(@)` of these cells ?

Options

A. `II gt IIII`
B. `IIgtIgtIII`
C. `IgtIIgtIII`
D. `IIIgtIgtII`

Answer

B

Explanation

Given `Zn^(2+) rarrr Zn`
`Cu^(2+) rarr Cu`
`Ag^(+) rarr Ag`
Cell reaction of I is `Zn + Cu^(2+) rarr Zn^(2+) +Cu`
`E_(cell)^(@)=E_("oxidation" + E_("reduction")=+0.76 +0.34 =+1.10 V `
cell reaction of (III) is `Cu+Ag^(+) rarr Cu^(2+) +Ag`
`E_(cell)^(@) =- 0.34 +0.8 =+0.46 V`
So the correct order of `E_(Cell)^(@)` of these cell is `IIgt IgtIII`