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For M2+/M and M3+/M2+ systems the E° values for some metals are as follows:
Cr2+/Cr – 0.9 V Cr3+/Cr2+ – 0.4 V
Mn2+/Mn – 1.2 V Mn3+/Mn2+ + 1.5 V
Fe2+/Fe – 0.4 V Fe3+/Fe2+ + 0.8 V
Use this data to comment upon
(a)    The stability of Fe3+ in acid solution as compared to that of Cr3+ or Mn3+ and
(b)    In case with which iron can be oxidised as compared to the similar process for either chromium or manganese metal

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