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NaCl is heated in an atmosphere of sodiu...

NaCl is heated in an atmosphere of sodium vapour. The resultant yellow colour is due to the formation of

A

Frenkel defect

B

Schottky defect

C

F-centers

D

impurity defects

Text Solution

Verified by Experts

The correct Answer is:
C
Anion vacancies in alkali halides are produced by heating the alkali halide crystals in atomsphere of the alkali metal vapour. When the metal atoms deposite on the surface they diffuse into the crystal and after ionisation the alkali metal ion occupies cationic vacancies, whereas electron occupies anionic vacancey. Electrons trapped in an anion. Vaccanciaes are referred to as F-centeres that give rise to intresting colour in alkali halides.
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