8.17 For and systems the values for some metals are as follows:
Use this data to comment upon:
(i) the stability of in acid solution as compared to that of or
The value of is higher than that of but less than that of . So, the reduction of ferric ion () to ferrous ion() is easier than but as not easy as . Hence ferric ion is more stable than manganese ion(), but less stable than chromium ion().
Order of relative stablities of different ions is-