The coordination number of $Cu$ in $[Cu(H_2O)_4]^{2+}$ is ...... .

The coordination number of aluminum in its common complexes is

Metals have the tendency to lose electrons to form cations. When $Zn$ is added to $NaOH$,a complex is formed. In this complex,$Zn$ is present in:

The ligand present in lithium tetrahydroaluminate is........

What is the total number of ligands bonded to a central metal ion by coordinate (sigma) bonds called?

The number of water molecule $(s)$ not coordinated to copper ion directly in $CuSO_4 \cdot 5H_2O$ is