Question

Why covalent solid may even decompose before.Melting?

Answer 1

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Actually, all compounds decompose when heated to some point. It is just that some of them melt (and some even boil) before that decomposition temperature is reached. Compounds decompose thermally if one of the covalent bonds in the molecules is weak enough to break under the thermal motion.

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Answer 2

The crystal of covalent solids consists of a network of chemically bonded atoms. ... Such solids are very hard and brittle. They have extremely high melting points and may even decompose before melting. They are insulators and do not conduct electricity.