The appearance of colour in solid alkali metal halides is generally due to
(a) Schottky defect
(b) Frenkel defect
(c) Interstitial positions
(d) F-centre
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Option D is correct....
F-centre✌️✌️
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The appearance of colour in solid alkali metal halides is generally due to F-centres. Solids are rigid because the internuclear distance between the molecules of a solid are very less and closely packed and their positions are fixed due to the strong forces of attraction between them.
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