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

1. Schottky defect
2. Frenkel defect
3. Interstitial positions
4. F-centres

Correct answer: F-centres

Solution

The colour in solid alkali metal halides arises due to F-centres, which are anionic vacancies occupied by electrons. These electrons absorb light and impart colour to the crystal.

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