Question
Chemistry Question on The solid state
The appearance of colour in solid alkali metal halides is generally due to :
A
F-centres
B
Schottky defect
C
Frenkel defect
D
interstitial positions
Answer
F-centres
Explanation
Solution
The appearance in colour in solid alkali metal halides is usually 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.
The Correct option is (A): F-centres.