I. Those point defects that do not disturb the stoichiometry of the solid are called stoichiometric defects
II. These are also called intrinsic or thermodynamic defects.
III. For ionic solids these are of two types, vacancy and interstitial defects.
Which of these statement(s) is/are correct?

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I and II

II and III

I and III

All of these

answer is A.

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Detailed Solution

Vacancy and interstitial defects are the two types of stoichiometric defects observed in non-ionic solids.
ln case of ionic solids there defects are called Schottky defect and Frenkel defect.
Other two statements are true.

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