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

What is the total number of donor atoms present in the Tetracyanonickelate$(II)$ ion?

How can the coordination number of a metal atom in a complex be determined?

Define the following terms: Homoleptic and heteroleptic complexes.

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

When $1 \ mol$ of the complex $Co(NH_3)_5Cl_3$ is dissolved in water,it yields $3 \ mol$ of ions. When $1 \ mol$ of the same complex reacts with $2 \ mol$ of $AgNO_3$,it produces $2 \ mol$ of $AgCl_{(s)}$. What is the structure of this complex?