Which of the following statements for cyrstals having Frenkel defect is not correct?

Options

A. The density of crystals having Frenkel defect is less than that of a pure percfect crystal
B. In an ionic crystal having Frenkel defect may also contian Schottky defrect
C. Usually alkali halides do not Frenkel defect
D. Frenkel defects are observed where the difference in size of cation and anion is large

Answer

B