Question

Pink colour of LiCl crystals is due to: 

(a) Schottky defect 

(b)Frenkel defect 

(c) Metal excess defect 

(d) Metal deficiency defect

Answer 1

Correct answer is (c) Metal excess defect- 

It creates F-center in the crystal lattice which is due to a type of crystallographic defect in which an anionic vacancy in a crystal lattice is occupied by one or more unpaired electrons and that is responsible for the color.

Answer 2

Answer is (c) Metal excess defect (formation of F centres)