In which among the following solids, Schottky defect is NOT observed ? (A) ZnS (B) NaCl (C) KCl (D) CsCl

Correct option is A (ZnS)

Explanation:

In ZnS, the Schottky defect does not exist. NaCl, KCl, and CsCl all have the Schottky defect. The Schottky defect occurs in solids where the cations and anions are almost equal in size.