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

Question

Vimal Swarnkar · Accepted Answer

(d) F-Centres. Heating alkali halides in alkali vapour gives metal-excess defect: anion vacancies trap electrons = F-centres (Farbenzentren). They absorb visible light: NaCl yellow, KCl violet, LiCl pink → (d).

Answer

(a) Schottky defect

Answer

(b) Frenkel defect

Answer

(c) Interstitial Position

Geo-Scientist Prelims 2020 Chemistry Q14: The appearance of colour in solid alkali metal halides is generally…

QuestionSolid state / defects