As a rule,ionic compounds tend to have lower melting and boiling points than covalent compounds consisting of small molecules.

Question

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Ionic compounds generally have higher melting and boiling points than covalent compounds because the electrostatic forces between ions in an ionic compound are much stronger than the forces between molecules in a covalent compound, requiring more energy (heat) to break.

As a Rule,ionic Compounds Tend to Have Lower Melting and Boiling