Q. Which is the incorrect statement ?
A) $FeO_{0.98}$ has non stoichiometric metal deficiency defect.
B) Density decreases in case of crystals with Schottky's defect.
C) NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal.
D) Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal.
Explanation
[Solution] Frenkel defects occur where the cation is much smaller than the anion; similar sizes favour Schottky defects. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.