As a result of Schottky defect
There is no effect on density
Density increases
Density decreases
All of the above
In Schottky defect, cations and anions are missing from their lattice site due to which mass of crystal decreases but the volume of crystal remains the same, this causes a decrease in density. In this defect, the density of crystal decreases and crystal behaves as P-type semiconductor and conductivity of crystal increases.
% of missing unit
This defect is common in the compound having high coordination number and almost equal size of cation and anion.
ex : NaCl , KCl , CsCl , AgBr etc
Therefore, Option (3) is correct