Question

The strength of Van der Waal's forces increases with:

• A. increase in molecular size
• B. increase in the number of electrons in the molecule
• C. increase in molecular weight
• D. all of the above

Answer 1

Answer: (A), (C)

The correct options are
A increase in molecular size
C increase in molecular weight

Solution:- (A) and (B)

Van der Waals forces increases due to the increase in the number of electrons present and size of the molecule. Larger molecules have a larger “surface area” of its electron cloud, this also becoming subject to stronger Van der Walls forces.