Which of the following point defects are shown by AgBr (s) crystals?I. Schottky defectII. Frenkel defectIII. Metal excess defectIV. Metal deficiency defect

AgBr shows both Schottky as well as Frenkel defect. In AgBr both Ag+ and Br- ions are absent from the lattice causing Schottky defect.However, Ag+ ions are mobile, so they have a tendency to move aside the lattice and trapped in interstitial site, hence cause Frenkel detect.