( ii) Polar Molecular Solids: o The molecules like HCl, SO2, are formed by polar covalent bonds.
o
In polar Molecular solids the comprised atoms or molecules are held together by stronger dipole-dipole interactions.
o They are soft and non-conductors of electricity.
o
The melting points of these solids are higher than those of non-polar molecular solids and usually exist in liquid or gaseous state at room temperature and pressure.
o Molecules like SO2 and solid NH3 are some examples of such solids.