Identify the neutral ligand from the following.

Which statement about the coordination number of a cation is true?

Are the oxidation state and covalency of $Al$ in $[AlCl(H_{2}O)_{5}]^{2+}$ same?

Which of the following coordination compounds has a coordination number of $6$?

The anion of acetylacetone $(acac)$ forms $Co(acac)_3$ chelate with $Co^{3+}.$ The rings of the chelate are

On the basis of the following observations made with aqueous solutions,assign secondary valences to metals in the following compounds:

Formula	Moles of $AgCl$ precipitated per mole of the compound with excess $AgNO_3$
$(i) PdCl_2 \cdot 4NH_3$	$2$
$(ii) NiCl_2 \cdot 6H_2O$	$2$
$(iii) PtCl_4 \cdot 2HCl$	$0$
$(iv) CoCl_3 \cdot 4NH_3$	$1$
$(v) PtCl_2 \cdot 2NH_3$	$0$