Question

Which of the following option(s) is/are true regarding non-polar molecular solids?

• A. They are soft and non-conductors of electricity
• B. They have low melting point
• C. They are usually in liquid or gaseous state at room temperature and pressure.
• D. Atoms or molecules are held by weak dispersion forces or London forces

Answer 1

Answer: (A), (B), (C), (D)

Atoms or molecules are held by weak dispersion forces or London forces

In molecular solids, molecules are the constituent particle. They are held together by both intramolecular bond and intermolecular force.
Molecular solids formed by non-polar covalent bonds are called non-polar molecular solids.
Monatomic gases such as $He,Ar$ and homo diatomic molecules like $C{l}_2,H_2,I_2$ formed by non-polar covalent bond are non-polar molecular solids. These solids shows the following characteristics:
(a) Being covalent bonded by weak forces, they have low melting point and are usually in liquid or gases at room temperature and pressure.
(b) Atoms or molecules are held by weak dispersion force or London force
(c) Being non-polar, they are non-conductor of electricity.
Thus, option (d) is correct.