The `E^(@)` value in respect of the electrodes chromium `(Z=24)`, manganese `(Z=25)` and iron `(Z=26)` are : `Cr^(3+)//Cr^(2+)=-0.4V,Mn^(3+)//Mn^(2+)=+1.5V`, " " `Fe^(3+)//Fe^(2)=+0.8V`.
On the basic of the above information compare the feasibilities
of further oxidation of their `+2` oxidation states.

Explanation

`+2` oxidation state of Mn is mores stable than `+2` oxidation state of Fe which, in turn, is more stable that `+2` oxidation state of `Cr`. So the order of feasibility of further oxidation of `+2` oxidation state is `Cr^(2+)gtFe^(2+)gtMn^(2+)`