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a
Density decreases in case of crystals with Schottky defect.
b
NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezoelectric crystal.
c
Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal.
d
FeO0.98has non-stoichiometric metal deficiency defect.
answer is C.
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Detailed Solution
(c,d ) : Frenkel defect is favoured in those ionic compounds in which there is large difference in the size of cations and anions. Non-stoichiometric defects due to metal deficiency is shown by FexO where x=0.93 to 0.96.