Which of the following defects does NOT change the density of an ionic crystal?
A. Schottky defect
B. Metal excess defect due to anion vacancies
C. Vacancy defect
D. Frenkel defect
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Answer: D. Frenkel defect
In a Frenkel defect an ion only shifts to an interstitial site, so mass and volume stay the same.
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· 23 Oct 2026
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