Question

`{:("Element",Cr,Mn,Fe),(E^(underset(-)(o))(M^(2+)//M),-0.90V,-1.18V,-0.4V),(E^(underset(-)(o))(M^(3+)//M^(2+)),-0.41V,+1.57V,+0.8V):}` ltbr. Use this data to comment upon
(i) the stability of `Fe^(3+)` and `Mn^(2+)` in acid solutions,
(ii) The ease with which iron can be oxidised as compared to the similar process for either Cr or Mn metals.

Answer 1

(i) `Mn^(2+)` is more stable than `Fe^(3+)`
(ii) The order of getitng oxidised is `Mn gt Cr gt Fe`.