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# Which of the following statements is incorrect?

(1) Schottky defects arises due to absence of a cation or anion from the position which it is expected to occupy

(2) Schottky defects are more common in ionic compounds with high coordination numbers

(3) The density of crystals having Schottky defects is larger than that of a perfect crystal.

(4) The crystal having Schottky defect is electrical neutral as a whole

Answer: (3) The density of crystals having Schottky defects is larger than that of a perfect crystal.
The density is smaller than that of the perfect crystal because of the absence of cations and anions from their expected positions.