Which is the incorrect statement?

Options

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

Answer

A, B

Explanation

These are an incorrect statements in this question
(i) Frenkel defect is favoured in those ionic compounds which sizes of cation and anion are different
(ii) `Fe_(0.98)` has stochiometric metal deficiency defect.