Question

According to Werner's theory primary and secondary valency of [CoCl₃(NH₃)₃]Cl₃ is

Answer 1

The primary valency is the number of negative ions needed to satisfy the charge on the metal ion. In the complex given , three Cl^- ions are needed to satisfy the primary valency of the Co³⁺ ion.
Hence, primary valency:THREE

The secondary valency is the number of ions of molecules that are coordinated to the metal ion. Werner assumed that the secondary valency of the transition metal in these cobalt(III) complexes is six.
Clearly, the complex has 6 ligands coordinated to the metal ion.
Hence, secondary valency: SIX