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Vacancy and interstitial defects are shown by solids that are:

AMetallic
BGaseous
CNon-ionic
DIonic ones
Answer & Solution
Correct answer: C. Non-ionic
1. Ionic solids must keep their charges balanced. 2. Simple vacancies would upset that balance. 3. So these defects appear in non-ionic solids. _Source: syllabus Chemistry Part I, Chapter 1, The Solid State._
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