Question

When the solid changes into a liquid, there is no change in:

• A. Temperature
• B. Average kinetic energy of the molecules
• C. Both A and B
• D. Average distance between the molecules

Answer 1

The correct option is C

Both A and B

When the solid changes into a liquid, there is no change in temperature, so the average kinetic energy of the molecules does not change as it is a function of temperature, but the distance between the molecules on average increases. Some energy is required for increasing the separation between the attractive force between the molecules.