The number of coordinate bonds in $[Co(NH_3)_6]Cl_3$ is ...... .

What is the number of moles of donor atoms in $n$ mole of $NO_2^{-}$?

Which of the following complexes gives a white precipitate with a solution of barium chloride $(BaCl_2)$?

In $[X(SO_4)(NH_3)_5]Cl$,the coordination number and oxidation state of $X$ are respectively ...............

$EDTA$ (Ethylenediaminetetraacetate ion) is a hexadentate ligand. Identify the number of donor atoms in an $EDTA$ molecule that form coordinate bonds with a central metal atom or ion in a complex.

The sum of the oxidation state (magnitude) and the coordination number of cobalt in $Na[Co(bpy)Cl_4]$ is $.......$ (Given $bpy = 2,2'-bipyridine$)