1) Name the complex ion [Cu(CN)6]4-. The oxidation number of copper is +2.
2) Name the complex ion [Cu(NH3)2(H2O)4]2+. The oxidation number of copper is +2.
3) Name the complex ZnCl2(en)2. The oxidation number of zinc is +2.
4) Name the salt [Ni(H2O)3(CO)]SO4. The oxidation number of nickel is +2.
5) Name the salt K4[Pt(CO3)2F2] given that the carbonate ion acts as a monodentate ligand in the complex. The oxidation number of platinum is +2.