Which of the following coordination complexes is a heteroleptic complex?

Which of the following are examples of double salts?
$A$. $FeSO_4 \cdot (NH_4)_2SO_4 \cdot 6H_2O$
$B$. $CuSO_4 \cdot 4NH_3 \cdot H_2O$
$C$. $K_2SO_4 \cdot Al_2(SO_4)_3 \cdot 24H_2O$
$D$. $Fe(CN)_2 \cdot 4KCN$
Choose the correct answer.

Which of the following is not a chelating ligand?

The number of coordinate bonds in $[Co(NH_3)_6]Cl_3$ is ...... .

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

One mole of the coordination compound $Co(NH_3)_5Cl_3$ gives $3$ moles of ions upon dissolution in water. Furthermore,one mole of this complex reacts with $2$ moles of $AgNO_3$ solution to produce $2$ moles of $AgCl(s)$. The structure of the complex is: