$EDTA$ (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.

Define the following terms:
$1$. Coordination entity
$2$. Central metal ion

$A$ complex compound of $Co^{3+}$ with molecular formula $CoCl_{x} \cdot yNH_3$ gives a total of $3$ ions when dissolved in water. How many $Cl^{-}$ ions satisfy both primary and secondary valencies in this complex?

How many water molecules are hydrogen bonded in the following molecular formula $[Cu(H_{2}O)_{4}]^{2+} SO_{4}^{2-} \cdot H_{2}O$?

The number of neutral molecules or negative groups attached to the central metal atom in a complex ion is called:

Which of the following ligands is not ambidentate?
$(P) = NO_3^-$,$(Q) = NO_2^-$,$(R) = CN^-$,$(S) = SCN^-$