Question

why do ionic compounds have high melting point​

Answer 1

These oppositely charged compounds are held together by strong electrostatic forces of attraction. As these forces are very strong, a considerable amount of heat energy is required to break them. Hence, ionic compound have a high melting point. ... Among the strongest intermolecular forces are ionic bonds.

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Answer 2

Ionic compounds have high melting point because they are made up of ions which have electrical charges. Since the electrical charges attract each other, the inter-ionic bonds in Ionic compounds is very strong and it is hard to break them, resulting in high melting point.