The Solid State
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What makes the crystal of KCl appear sometimes violet?

This is due to F centre, electron become exicted and when they come to ground state they radiate energy in visible reigon.
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    Give reasons for the following:
    Covalent crystals like diamond and silicon carbide are quite hard and difficult to break.
    Answer
    Name the crystal defect which lowers the density of an ionic crystal
    Answer
    Give reasons for the following:
    Ionic solids, inspite of being made up of ions, do not conduct electricity.
    Answer
    What is the effect of Schottky and Frenkel defects on the density of crystalline solids?
    Answer
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