What is the number of $=N-OH$ groups present in dimethyl glyoximato?

State the rules to write the formulas of mononuclear coordination entities.

In $K_4[Fe(CN)_6]$,the primary valency of iron is .........

What is the total number of ions released in the aqueous solution of ferric hexacyanoferrate $(II)$?

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

The $NO$ molecule,