A. High intermolecular forces of attraction. If there are high intermolecular forces, the molecules will need large energies to escape into the liquid. The substance will nave a high melting point.
The other options are incorrect because they are weak forces. They would cause low melting points.
Answer: Option (A) is the correct answer.
Explanation:
Melting point is defined as the point where a solid substance starts to convert into a liquid state.
For example, ice starts to melt at a temperature above 0 degree celsius.
More strong is the intermolecular forces of attraction present in a substance more will be the heat required by it to break the bonds between its particles. So, that its state can be changed.
For example, a solid substance required more heating as compared to a liquid substance to change its state.
Thus, we can conclude that high intermolecular forces of attraction is generally responsible for high melting points.
