Which of the folloiwng can't exhibits Frenkel defect?

Options

A. `ZnS`
B. `NaCl`
C. `AgBr`
D. `AgCl`

Answer

2

Explanation

In pure alkali halides, Frenkel defects are not found since the big alkali metal ions cannot get into the interstital sites, Frenkel defects are found in silver halides beacause of the small size of the `Ag^(+)` ion. In certain ionic solids such as `AgBr` both Schottky and Frenkel defeat occur.
Frenkel defect is also shown by `ZnS` due to small size of `Zn^(2+)` ions.