c
The structure of \(\mathrm{CuSO}_{4} .5 \mathrm{H}_{2} \mathrm{O}\) in the solid-state is shown above. The \(\mathrm{Cu}^{2+}\) ions are attracted towards \(\mathrm{SO}_{4}^{2-}\) ions not only by ionic interactions (electrovalent) but also by coordinate covalent bonds.

The \(\mathrm{Cu}^{2+}\) ions form coordinate covalent bonds with water as well as sulfate ions. There are covalent bonds in water and sulfate ions.