Question

Inert gases are mixed in iodine vapours. Then there are ........ between them.

(a) H-bonding 

(b) van der Waals forces 

(c) electrostatic forces 

(d) metallic bonds

Answer 1

The correct option is (b) van der Waals forces.

Explanation:

There are several types of van der Waals attraction : dipole-dipole, dipole-induced-dipole and spontaneous-dipole-induced-dipole. The spontaneous-dipole-induced-dipole attractions are also known as London dispersion forces. LDF are surprisingly strong but are only short range forces e.g. surface of neutral molecules or inert gases. A11 molecules have LDF and strength increases with the sizelsurface area of the molecule. In case of halogens, LDF increases as F₂ < Cl₂ < Br₂ < I₂