Which is the incorrect statement?

Options

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

Answer

C, D

Explanation

In Frenkel defect, the size of cation should be smaller than of anion.
is also incorrect because `Fe_(0.93) O` is metal deficient non-stoichiometric compound.