Which complex among the following gives a white precipitate on treatment with an aqueous solution of barium chloride?

The bonds in $K_4[Fe(CN)_6]$ are:

If the addition of $AgNO_3$ to a solution of $Co(NH_3)_5Cl_3$ results in the precipitation of $AgCl$ corresponding to two ionizable chloride ions,it means that ..............

$A$ solution of potassium ferrocyanide would contain $.......$ ions.

What is the coordination number of cobalt in $[Co(NH_3)_4Cl_2]Cl$?

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.