Solid State Question 297
Question: The appearance of colour in solid alkali meta halides is generally due to:
Options:
A) Schottky defect
B) Frenkel defect
C) Interstitial position
D) F-centres
Show Answer
Answer:
Correct Answer: D
Solution:
[d] The appearance of colour in alkali metal halides is generally due to F-centres. F centers in $ NaCl $ produce a band of optical absorption towards the blue end of visible spectrum, thus the colour appears yellow under transmitted light. On the other hand, $ KCl $ with F-centers appears magenta, and $ KBr $ appears blue.
BETA
