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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 VMn2+/Mn – 1.2 V Mn3+/Mn2+ + 1.5 VFe2+/Fe – 0.4 V Fe3+/Fe2+ + 0.8 VUse 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