Concept:Electrovalent (ionic) compounds are held together by strong electrostatic forces of attraction between oppositely charged ions, giving them very high melting and boiling points.
Explanation:In electrovalent compounds, positive and negative ions are tightly packed in a giant crystal lattice.
A large amount of heat energy is needed to overcome the strong ionic bonds and separate the ions.
Therefore, such solids have high melting points and high boiling points.
Covalent compounds usually exist as simple molecules with weak intermolecular forces, so they have low melting and boiling points.
Dative compounds are a type of covalent bonding and do not necessarily give high melting points.
Non-metals are generally molecular solids with low melting points.
Hence, among the given options, an electrovalent compound fits the description best.
Answer:C. An Electrovalent compound.