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For M2+/M and M3+/M2+ systems, Eº 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+and Mn3+. (b) The ease with which iron can be oxidized as compared to the similar process for either Cror Mn metals

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