Name the complex compounds, calculate the oxidation state of the complexing agent, the coordination number of the complexing agent and the oxidation state of the complex ion; specify the ligands and write the equation of the instability constant: [Co(H2O)(NH3)2(CN)]Br2; [Cr(H2O)3(C2O4)Cl]; (NH4)[Hg(SCN)4]; [Pd(NH3)3Cl]2[P3Cl4]