Give the oxidation state of the metal for each of the following oxides of the first transition…

Give the oxidation state of the metal for each of the
following oxides of the first transition series. (Hint: Oxides of formula M3O4
are examples of mixed valence compounds in which the metal ion is present in
more than one oxidation state. It is possible to write these compound formulas
in the equivalent format MO_M2O3 , to permit estimation of the metal’s
two oxidation states.)

 (a) Sc2O3

 (b) TiO2

 (c) V2O5

 (d) CrO3

 (e) MnO2

(f) Fe3O4

 (g) Co3O4

 (h) NiO

 (i) Cu2O