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# Which of the following statements is incorrect?

(1) Frenkel defects arises where the difference in sizes of cations or anions is large

(2) The density of crystals having Frenkel defects may also contain Schottky defects

(3) Ionic crystal having Frenkel defects may also contain Schottky defects

(4) Pure Alkali halides do not have Frenkel defects

Answer: (2) The density of crystals having Frenkel defects may also contain Schottky defects
The density of crystals having Frenkel defects is identical to that of a pure crystal.