1.

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.

Answer»

For
M
2+/M
and M
3+/M2+
systems, the

values for some metals are as follows:



Cr2+/Cr
−0.9V


Cr3/Cr2+
−0.4 V


Mn2+/Mn
−1.2V


Mn3+
/Mn
2+
+1.5 V


Fe2+
/Fe
−0.4V


Fe3+/Fe2+
+0.8 V



Use
this data to comment upon:


(i) The
stability of Fe
3+
in acid solution as compared to that of Cr
3+
or Mn
3+
and



(ii) The
ease with which iron can be oxidised as compared to a similar process
for either chromium or manganese metal.



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