Question

Which of the following is a correct statement regarding defects in crystalline solids?

• A. Frenkel defect is a dislocation defect.
• B. Frenkel defect is a found in halides of alkaline metals.
• C. Schottky defects have no effect on the density of crystalline solids.
• D. Frenkel defects decrease the density of crystalline solids.

Answer 1

The correct option is A Frenkel defect is a dislocation defect.

(A) Frenkel defect is a dislocation defect. It arises due to a vacancy at cationic site. The cation moves to another position between the two layers and is surrounded by greater number of anions.
(B) Frenkel defect is a found in ZnS, AgBr, AgI, AgCl etc.
(C) Due to Schottky defects, the density of crystals decreases.
(D) Frenkel defects have no effect on the density of crystalline solids.