According to the Lewis theory,a ligand is .......

One mole of the complex compound $Co(NH_3)_5Cl_3$ gives $3$ moles of ions on dissolution in water. One mole of the same complex reacts with two moles of $AgNO_3$ solution to yield two moles of $AgCl_{(s)}$. The structure of the complex is

For the complexes $(A) \ CoCl_3 \cdot 6NH_3$,$(B) \ CoCl_3 \cdot 5NH_3$,and $(C) \ CoCl_3 \cdot 4NH_3$,if the secondary valency of $Co$ is $6$,what is its primary valency in each case?

One mole of the octahedral complex compound $Co(NH_3)_5Cl_3$ gives $3$ moles of ions on dissolution in water. One mole of the same complex reacts with excess of $AgNO_3$ solution to yield two moles of $AgCl_{(s)}$. The structure of the complex is :

Which among the following is a monodentate ligand?

Which molecule/ion among the following cannot act as a ligand in complex compounds?