Which of the following is an ambidentate ligand?

The coordination number of $Pt$ in $[Pt(NH_3)_4Cl_2]^{2+}$ ion is

Identify the neutral ligand from the following.

The number of ions per mole of a complex $[CoCl_2 \cdot 5NH_3]Cl_2$ in aqueous solution will be

$EDTA$ (Ethylenediaminetetraacetate ion) is a hexadentate ligand. Identify the number of donor atoms in an $EDTA$ molecule that form coordinate bonds with a central metal atom or ion in a complex.

Which of the following coordination complexes contains both anionic and neutral ligands?