Chemistry - Solid State Question with Solution | TestHub

Frenkel defect is exhibited by ionic compounds in which there is a large difference in the size of the cation and the anion. The smaller ion (usually the cation) is dislocated from its normal site to an interstitial site.

$\text{ZnS}$ shows Frenkel defect because of the small size of the ${\text{Zn}}^{2+}$ ion compared to the ${\text{S}}^{2-}$ ion.

Alkali metal halides like $\text{NaCl}$, $\text{KCl}$, and $\text{KBr}$ exhibit Schottky defect because their cations and anions are of almost similar sizes.

Answer: $\text{ZnS}$