4. Solid X is a very hard solid which is electrical insulator in
solid as well as in molten state and has extremely high
melting point. What type of solid is it?
(a) lonic solid (b) Covalent solid
(c) Metallic solid (d) Molecular solid
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Answer:
The correct answer is option (b)
Explanation:
Covalent solids have high melting point due to their interconnected covalent bonds. Since there are no free electrons present in covalent solids, so they do not conduct electricity in solid state as well as molten state. Some of the examples are Diamond and Quartz.
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