Identify the anionic sphere complex from the following.

In which of the following compounds does the transition metal have a zero oxidation state?

In the complex ion $[Co(NH_3)_6]^{3+}$,the $NH_3$ molecules are linked to the metal atom by .......

Total number of moles of $AgCl$ precipitated on addition of excess of $AgNO_3$ to one mole each of the following complexes $[Co(NH_3)_4Cl_2]Cl$,$[Ni(H_2O)_6]Cl_2$,$[Pt(NH_3)_2Cl_2]$ and $[Pd(NH_3)_4]Cl_2$ is $...............$ (in $.00$)

The number of moles of $AgCl$ precipitate formed when an excess of $AgNO_3$ is added to one mole of $[Cr(NH_3)_4Cl_2]Cl$ is:

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, . . . . . . .