What is the coordination number of cobalt in $[Co(NH_3)_3Cl_3]$?

Which of the following ligands is neutral?

Identify the total number of complexes from the following list that contain only monodentate ligands:
$(a)$ $[Ni(CN)_4]^{2-}$ (Tetracyanonickelate $(II)$ ion)
$(b)$ $K_3[AlF_6]$ (Potassium hexafluoroaluminate $(III)$)
$(c)$ $[Cu(NH_3)_4]^{2+}$ (Tetraamminecopper$(II)$ ion)
$(d)$ $K_3[Al(C_2O_4)_3]$ (Potassium trioxalatoaluminate $(III)$)

Explain double salts and coordination compounds.

Ethylene diaminetetraacetate $(EDTA^{4-})$ ion is:

The complex hexamineplatinum$(IV)$ chloride will give how many ions upon ionization?