Which is the incorrect statement?

Options

A. `FeO_(0.98)` has non-stoichiometric metal deficiency defect.
B. Density decreases in case of crystals with Schottky's defect.
C. NaCl(s) is insulator, silicon is semi-conductor, silver is conductor, quartz is piezo electric crystal.
D. Frenkel defect is favoured in those ionic compounds in which sizes of cation and anion are almost equal.

Answer

D