Question

What type of non-stoichiometric point defect is responsible for the pink colour of LiCl?

Answer 1

Metal excess defect due to anion vaccancy. The formation of F-centre is responsible for the Pink colour of Licl.

Answer 2

Explanation:

Non-stoichiometric point defect - Metal excess - Anionic vacancies

Negative ion missing from its lattice position, this empty position is occupied by an electron in order to maintain electrical neutrality of the crystal. The sites containing electrons instead of an anions are called F- centers. These centers are responsible for the pink color of the LiCl crystal.