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Q.

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

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a

Schottky defect

b

F-centres

c

Interstitials

d

Frenkel defect

answer is B.

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Detailed Solution

In an F-center defect, an anionic vacancy in a crystal is filled with one or more unpaired electrons.

These electrons take in visible light and as a result, emit colour.

As a result, in solid alkali metal halides, the F-center is frequently to blame for the appearance of colour.

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