Question
Chemistry Question on The solid state
The appearance of colour in solid alkali metal halides is generally due to :
A
Schottky defect
B
Frenkel defect
C
Interstitial position
D
F-centres
Answer
F-centres
Explanation
Solution
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.