Which ionic salt does or does not show Frenkel defect

This type of question, asked 2 times: 13 Apr 2026 S2, 19 May 2026 S2. All 2 questions below, oldest first.

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Question 1
13 Apr 2026 S2
20 $Which from following ionic crystals exhibits Frenkel defect?$
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Question 2
19 May 2026 S2
19 $Which of the following salts does NOT exhibit Frenkel defect?$
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