Which of the following point defect are shown by AgBr_(s) crystals? 

i.Schottky defect

ii.Frenkel defect

iii.Metal excess defect

iv.Metal deficiency defect

AgBr shows both Schottky, as well as the Frenkel detect. In AgBr, both Ag⁺ and Br⁻ ions are absent from the lattice causing the 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 defect.