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

F-centres

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Schottky defect

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Interstitial positions

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Frenkel defect

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Solution

The correct option is A F-centres
In metal excess defect, an anionic vacancy in a crystal is filled by one or more unpaired electrons at F-centre.
These electrons absorb visible light and emit colour. As a result, the F-centre is often responsible for the appearance of colour in solid alkali metal halides.

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

L i F

N H_{3}

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