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

Which among the following is $NOT$ a neutral ligand?

What is the number of donor atoms in dimethylglyoximato ligand?

Given below are two statements :
Statement $I$ : $[Co(NH_3)_6]^{3+}$ is a homoleptic complex whereas $[Co(NH_3)_4 Cl_2]^{+}$ is a heteroleptic complex.
Statement $II$ : Complex $[Co(NH_3)_6]^{3+}$ has only one kind of ligands but $[Co(NH_3)_4 Cl_2]^{+}$ has more than one kind of ligands.
In the light of the above statements,choose the correct answer from the options given below.

Explain with two examples each of the following: coordination entity,ligand,coordination number,coordination polyhedron,homoleptic and heteroleptic.

Which of the following is a neutral ligand?