Question

Critical temperatures of the gases $A,B,C$ and $D$ are:
(i) 5.2 $K$ (ii) 33.2 $K$ (iii) 126.3 $K$ (iv) 191.1 $K$ respectively.
Arrange them in the ascending order of intermolecular forces of attraction.

• A. $C<B<D<A$
• B. $A<B<C<D$
• C. $D<C<B>A$
• D. $A<C<B<D$

Answer 1

The correct option is B $A<B<C<D$

At critical point , solid, liquid and vapour are all in equilibrium. Therefore, stronger the forces of attraction, more is the thermal energy required to overcome them, hence, higher is the temperature. Therefore, the correct ascending order of intermolecular forces of attraction is $A,B,C$ and $D$.