A) Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal
B) \[Fe{{O}_{0.98}}\] has non stoichiometric metal deficiency defect
C) Density decreases in case of crystals with Schottky's defect
D) \[NaCl(s)\] is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal
Correct Answer: A , B
Solution :
(a & b)* Frenkel defect occurs in those ionic compounds in which size of cation and anion is largely different. Non-stoichiometric ferrous oxide is \[F{{e}_{0.93-0.96}}{{O}_{1.00}}\] and it is due to metal deficiency defect.
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