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 cations and anions. In such defects, the smaller ion (usually the cation) is dislocated from its normal site to an interstitial site. Examples include $\text{ZnS}$, $\text{AgCl}$, $\text{AgBr}$, and $\text{AgI}$.

$\text{NaCl}$ consists of ${\text{Na}}^{+}$ and ${\text{Cl}}^{-}$ ions which are of comparable sizes. Therefore, it exhibits Schottky defect rather than Frenkel defect.

${\text{CaF}}_2$ exhibits anion Frenkel defect because the ${\text{F}}^{-}$ ions can occupy interstitial sites.

Answer: $\text{NaCl}$