For M^(2+)//M and M^(3+)//M^(2+) systemsthe E^(@) values for some metals are as follows: {:(Cr^(2+)//Cr,-0.9V,Cr^(3)//Cr^(2+),-0.4V),(Mn^(2+)//Mn,-1.2V,Mn^(3+)//Mn^(2+),+1.5V),(Fe^(2+)//Fe,-0.4V,Fe^(3+)//Fe^(2+),+0.8V):} 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 chrmoium or magnganess metal.

For M^(2+)//M and M^(3+)//M^(2+) systemsthe E^(@) values for some meta

1.	For M^(2+)//M and M^(3+)//M^(2+) systemsthe E^(@) values for some metals are as follows: {:(Cr^(2+)//Cr,-0.9V,Cr^(3)//Cr^(2+),-0.4V),(Mn^(2+)//Mn,-1.2V,Mn^(3+)//Mn^(2+),+1.5V),(Fe^(2+)//Fe,-0.4V,Fe^(3+)//Fe^(2+),+0.8V):} 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 chrmoium or magnganess metal.
Answer» SOLUTION :(i) The `M^(3+)\|M^(2+)` values suggest that `Fe^(3+)` ions in acidic medium is more STABLE than `Mn^(3+)` ions and LESS stable than `Cr^(3+)` because of higher reduction potential. (ii) `M^(2+)\|M` is most negative for Mn and hence Mn will be most easily oxidized. The ease wiht which OXIDATION occurs will be `Mn gt Cr gt Fe`