The appearance of colour in solide state of alkali metal halides is generally due to `:`
A
Frenkel defect
B
Interstitial positions
C
`F-`centres
D
Schottky defect
Text Solution
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The correct Answer is:
c
Presence of excess `Na ` in `NaCl` makes it yellow, presence of excess `Li` in `LiCl` makes it pink, presence of excess `K` in `KCl` makes it violet. Greater the no. of `F-` centres, greater is intensity of colour.
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