(i) There are two types of molecules.
a. Molecules of elements: Molecules of elements are homoatomic(Atoms of the same element).
They can be Monoatomic, diatomic or polyatomic. For example, H2, Cl2, O3, P4, S8,etc.
b. Molecules of compounds: Molecules of compounds are always hetero-atomic(Atoms of different elements). They can be diatomic, polyatomic. For example, CO2, FeCl3, C6H12O6, etc.
(ii) Five compounds used in our daily life are:
1. Common salt
2. Water
3. Soap
4. Baking soda
5. Sugar