Question

Which of the following properties of liquids arise because of the molecular interaction and thermal energy?
I. Vapour pressure
II. Surface tension
III. Viscosity

• A. I and II
• B. I and III
• C. II and III
• D. I, II and III

Answer 1

The correct option is D I, II and III

Vapour pressure, surface tension and viscosity are some of the typical physical properties of liquid that arises because of two competing forces - the molecular interaction and thermal energy.
Surface tension and viscosity of liquid decreases with increase in temperature and is directly related to intermolecular forces. While vapour pressure increases with increase in temperature and thus it is inversely related with intermolecular forces.

Hence, the correct answer is option (d).