The density of crystal suffering from Frenkel defect is:
Increases
Decreases
Remain same
All of the above
In Frenkel defect, cation or anion or both are missing from their correct lattice site and occupy the interstitial space so the mass of crystal is not affected, hence the density of crystal remains same.
In this defect, the density of the crystal remains the same but conductivity increases and the crystal behaves as a p-type semiconductor. This defect is found in the compound having a low coordination number and having a significant size difference between cation and anion.
Ex: transition metal halides, CuCl, CuBr, AgBr, AgI, ZnS, etc.
Therefore, Option (3) is correct