a)Chemistry of the Peroxo chromates:
peroxochromate is prepared by reacting hydrogen peroxide with metal
chromate at low temperatures
2CrO42- + 8H2O2
-----------> 2[Cr(O2)4]2- +
8H2O
[Cr(O2)4]2- is called
tetraperoxochromate with oxidation number +4 and is reduced by
hydrogen peroxide,which results in forming
tetraperoxochromate(V)
2[Cr(O2)4]2- +
H2O2 + 2OH- ----------->
  2[Cr(O2)4]3- +
2H2O + O2
From this reaction
[Cr(O2)4]4- can also
form which is unstable and has oxidaation number +6
b) Electronic structure of Mn(III) compunds:
  electronic configuration of Mn+3 is
[Ar]3d4
 Â
c) Chemistry of Manganese (IV) complexes:
  The +3 oxidation state compounds of Manganese
complexes, are quite powerful oxidizing agents in aqueous solutions
and also disproptionate forming manganese(II) and manganese(IV)
complexes.
  Â
  Â
 Â
