Chemistry - Solid State Question with Solution | TestHub

In $\text{AgCl}$, the size of the ${\text{Ag}}^{+}$ ion is smaller than that of the ${\text{Cl}}^{-}$ ion. This allows the ${\text{Ag}}^{+}$ ions to leave their normal lattice sites and occupy interstitial sites, resulting in a cation Frenkel defect.

In ${\text{CaF}}_2$, the size of the ${\text{F}}^{-}$ ion is smaller than that of the ${\text{Ca}}^{2+}$ ion. The ${\text{F}}^{-}$ ions can leave their normal lattice sites and occupy interstitial sites, resulting in an anion Frenkel defect.

Answer: AgCl has cation Frenkel defect and ${\text{CaF}}_2$ has anion Frenkel defect.