Concept:During a change of state, the heat absorbed is used to overcome intermolecular forces instead of raising temperature.
Explanation:When a solid reaches its melting point, further heating supplies thermal energy to the substance.
This energy does not increase the average kinetic energy of the molecules, so the temperature stays constant.
The supplied heat is absorbed as latent heat of fusion.
It is used to break the intermolecular bonds that hold the molecules firmly in the solid lattice.
After the bonds are broken, the solid changes completely into the liquid state.
Because all the heat is consumed in breaking these bonds, no temperature rise is observed during melting.
Answer:D. All the heat is used to break the bonds holding the molecules of the solid together.