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

F-centres

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Schottky defect

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Frenkel defect

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Interstitial positions

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Solution

The correct option is A F-centres
The appearance in colour in solid alkali metal halides is generally due to $F -$ centres. When electrons occupy the vacant space of anions due to the presence of excess of metal ions, are called F-centres.

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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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