## Chemistry and Chemical Reactivity (9th Edition)

1) No change in NOX of any species. 2) Cu and Cl change their NOXs: $Cu:0, Cl_2:0, Cu^{2+}:+2,Cl^-:-1$ 3) No change in NOX of any species. 4) S and I change their NOXs: $I^-2:0,S_2O_3^{2-}, (S):+2,\ I^-:-1,\ S_4O_6^{2-}, (S):+2.5$