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Give reasons for the following:
Covalent crystals like diamond and silicon carbide are quite hard and difficult to break.


In covalent crystals, the shared pair of electrons give rise to very strong forces between them, therefore covalent solids like diamond and silicon carbide are quite hard and difficult to break and show very high melting points.
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What is the effect of Schottky and Frenkel defects on the density of crystalline solids?

Name the crystal defect which lowers the density of an ionic crystal

Give reasons for the following:
Ionic solids, inspite of being made up of ions, do not conduct electricity.

What makes the crystal of KCl appear sometimes violet?

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