Match the following columns :

Colwnn-1	Colwnn-II
(a) ${\mathrm{NH}}_4\mathrm{Cl}$	(p) Hydrogen bond
(b) ${\mathrm{CuSO}}_4\cdot 5{\mathrm{H}}_2\mathrm{O}$	(q) Co-ordlnate bond
(c) $\mathrm{HNC}$	(r) Ionic bond
(d) liquid ${\mathrm{H}}_2{\mathrm{O}}_2$	(s) Covalent bond

An ionic bond is formed between the ${\mathrm{NH}}_4\mathrm{Cl}$ ions in an ${\mathrm{NH}}_4\mathrm{Cl}$ molecule, three covalent bonds are formed between the N and three H atoms, and one coordinate bond is formed between the N and one H atom.
The solid-state structure of ${\mathrm{CuSO}}_4\cdot 5{\mathrm{H}}_2\mathrm{O}$ is depicted above. ${\mathrm{Cu}}^{2+}$ ions are attracted to SO 4 2 ions not only by ionic interactions (electrovalent), but also by coordinate covalent bonds.

Cu 2+ ions form coordinate covalent bonds with water and sulphate ions. Water and sulphate ions both have covalent bonds.