NEET 2006 Chemistry question

Not in JEE Main or NEET syllabus

The appearance of colour in solid alkali metal halides is generally due to :

(1)F-centresCorrect
(2)Schottky defect
(3)Frenkel defect
(4)Interstitial positions

Answer: (1)

Solution

When an alkali metal halide crystal is heated in the vapour of the alkali metal, halide ions leave their lattice sites, creating anion vacancies, which are occupied by electrons. These trapped electrons (F-centres, from German Farbe = colour) absorb visible light and impart

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Question ID VK-089599