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

What is the secondary valence of $$\mathrm{Co}^{3+}$$ ion according to Werner's theory in $$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+}$$?

What is the effective atomic number of $$\mathrm{Zn}$$ in $$\left[\mathrm{Zn}\left(\mathrm{NH}_3\right)_4\right] \mathrm{SO}_4$$ ?

Identify the tetradentate ligand from the following.