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Why sodium chloride on heating with sodi...

Why sodium chloride on heating with sodium vapours acquires yellow colour?

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Sodium chloride on heating with sodium vapours acquires yellow colour because sodium chloride crystal undergoes metal excess defect with sodium vapours when heated. The chloride ions diffuses to the surface of the crystals and combine with Na atoms which get ionized to `Na^(+)` ions by losing electrons. These electrons get trapped in anion vacancies and act as F-centres which impart colour to the crystal.
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