1.

The correct order of E_(M^(2+)//M)^(@) Values with negative sign for the four successive elements Cr, Mn, Fe and Co is:

Answer»

`MngtCrgtFegtCo`
`CrgtFegtMngtCo`
`FegtMngtCrgtCo`
`CrgtMngtFegtCo`

Solution :`E_(Mn^(2+),Mn)^(@)=-1.18V,E_(CR^(2+),Cr)^(@)=-0.91V`
`E_(Fe^(2+),Fe)^(@)=-0.44V,E_(CO^(2+),Co)^(@)=-0.28V`


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