Schottky defect in crystals is observed when

Schottky defect is observed when equal number of cations and anions are missing from the lattice. This defect changes the density as a pair of ions are missing from the lattice. Hence the correct answer is option (c) 130. Schottky defect is observed in the crystal of (a) NaCl (b) TiCl (c) AgCl (d) MgCl₂ In non-ionic crystals, it means a lattice vacancy defect. In ionic-crystals, the defect forms when oppositely charged ions leave their lattice sites, creating vacancies. E.g. AgBr, NaCl shows Schottky defect observed in NaCl crystal. Hence the correct an