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ForM2+/Mand M3+/M2+systems, the values for some metals are as follows:Cr2+/Cr −0.9VCr3/Cr2+ −0.4 VMn2+/Mn −1.2VMn3+/Mn2+ +1.5 VFe2+/Fe −0.4VFe3+/Fe2+ +0.8 VUsethis data to comment upon:(i) Thestability of Fe3+in acid solution as compared to that of Cr3+or Mn3+and(ii) Theease with which iron can be oxidised as compared to a similar processfor either chromium or manganese metal. |
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Answer» For Cr2+/Cr Cr3/Cr2+ Mn2+/Mn Mn3+ Fe2+ Fe3+/Fe2+ Use (i) The
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