Defects are basically irregularities in the arrangement of constituent particles. Broadly speaking the defects are of two types. Namely point defects and line defects.
Point defects: The irregularities or deviations from ideal arrangement around a point or an atom in the crystalline substance.
Line defects: The irregularities or deviations from ideal arrangement in entire row of lattice points.
Answer the following question.
When crystals of LiCI is heated in an atmosphere of Li (vap). it appears pink in colour because of

Options

A. Metal excess defect due to anionic vaccanies.
B. Metal excess defect due to presence of extra cation at interstial site.
C. Metal deficiency defect.
D. Schottky defect.