Question

When the temperature is raised, viscosity of the liquid decreases. This is because:

• A. volume of the solution decreases
• B. increase in temperature increases the average kinetic energy of the molecules which overcomes the attractive forces between them
• C. covalent and hydrogen bond forces decreases
• D. attraction between the molecule increases.

Answer 1

The correct option is B increase in temperature increases the average kinetic energy of the molecules which overcomes the attractive forces between them

When temperature increases, the energy level of liquid molecules increases (kinetic energy increases) and the distance between the molecule increases. It causes a decrease in inter-molecular attraction between them, which reduces viscosity.