What is the value of the primary valence of $Co$ in $CoCl_{3}$?

All ligands are .....

The coordination number of cobalt in the coordination compound $[Co(en)_2Br_2]Cl_2$ is ........ .

Which of the following gives a white precipitate with $AgNO_3$?

The primary valency and secondary valency of the central metal ion and the number of total ions produced in an aqueous solution for the $K[Co(OX)_2(NH_3)_2]$ complex are,respectively, . . . . . . .

Which among the following complexes is a neutral complex?