The given ligand 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?

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

Write a note on ambidentate ligands.

Number of ambidentate ligands in a representative metal complex $[M(en)(SCN)_4]$ is $[en = \text{ethylenediamine}]$

The molecular formula of potash alum is