1) Help me naming this complex compounds. Thank You in advance.

1) Help me naming this complex compounds. Thank You in advance.
[CoCl2(NH3)4]NO2
[Cu(NH3)4]2+[PtCl4]2-
[CoCl(NH3)4(NO2)]Cl
[Co(N3)(NH3)5]SO4
2) What are ambidentate ligands? Give Examples.

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