The chemical reaction
[tex]CuSO_{4} + BaCl_{2} yields BaSO_{4} + Cu Cl_{2}[/tex]
is not an oxidation-reduction reaction because there is no trasfer of electrons. The following are the oxidation numbers of the species involved:
Reactants side:
Cu = +2
Sulfate ion = -2
Cl2 = -2
Ba = +2
Products side:
Cu = +2
Sulpahte Ion = -2
Cl2 = -2
Ba = +2
