Which is the incorrect statement?

Options

A. Density decrease in case of crystals with schottky's defect
B. `NaCI(s)` is insulator, silicon is semiconductor, silver is conductor, quarts is piezoelectric crystal
C. Frenkel defect is favoured in those inonic compounds in which sizes of cations and aninos are almost equal
D. `FeO_(0.98)` has non stocihiometric metal deficiency defect

Answer

C

Explanation

Frenkel defect is present in those ionic compondts which have low coodination numbe due to large difference in the size of cations and anions.
It should `Fe_(O.98) O` for metal deficiency defect.