2 13:  Corrosion of iron in atmosphere
Oxidation: Fe (s)®   Fe2+ (aq) +2e–
Reduction: O2
Atomospheric (g) + 4H+(aq) +4e– ® 2H2O(l)
oxidation: 2Fe2+(aq) + 2H2O(l) + ½O2(g) ® Fe2O3(s) + 4H+(aq)
to thermal plants whose efficiency is about 40% There has been
tremendous progress in the development of new electrode materials,
better catalysts and electrolytes for increasing the efficiency of fuel cells These have been used in automobiles on an experimental basis