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

Options

A. `MngtCrgtFegtCo`
B. `CrgtFegtMngtCo`
C. `FegtMngtCrgtCo`
D. `CrgtMngtFegtCo`

Answer

1

Explanation

Generally across the first transition series, the negative value for standard electrode potential decrease (exception `Mn`-due to stable `d^(5)` configuration)
Standard electrode potential- `{:(,Mn,Cr,Fe,Co,),(M^(2+)//M,-1.18,-0.90,-0.44,-0.28,eV):}`
So, correct order is `MngtCrgtFegtCo.`