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Schottky and frenkel defects are stoichi...

Schottky and frenkel defects are stoichiometric defects.
When pure NaCl(sodium chloride) crystal is heated in an atmosphere of sodium vapours, it turns yellow. Give reason.

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This is due to the presence of electrons in some lattice sites in place of anions.These sites act as F - centres
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  11. Why is Frenkel defect not found in alkali metal halides?

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