5 V
Fe
2+/Fe
-0 4V
Fe
3+/Fe
2+
+0 8 V
Use this data to comment upon:
(i) the stability of Fe3+ in acid solution as compared to that of Cr3+ or Mn3+
 and
(ii) the ease with which iron can be oxidised as compared to a similar process
for either chromium or manganese metal 4