Question

Which of the following quantities increases when a liquid at room temperature becomes a gas at its boiling point?

• A. The average kinetic energy of the molecules
• B. The molecular size
• C. The total number of molecules
• D. All of these

Answer 1

The correct option is A The average kinetic energy of the molecules

When heat is supplied to a liquid at room temperature, the temperature of the liquid increases. The liquid changes its state to gas at its boiling point. Hence, the average kinetic energy of the molecules changes (increases)