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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ss200

A crystal of shows Frenkel defects. Which statements are correct?

  1. AThe number of cation vacancies equals the number of interstitial cations.
  2. BThe density of the crystal remains unchanged.
  3. CThe ratio remains 1 : 1.
  4. DThe defect is favoured by a large cation and a small anion.

Answer: A, B, C

Each Frenkel defect creates one vacancy and one interstitial, so their numbers are equal (true). No ion leaves the crystal, so the density and the 1:1 ratio are unchanged (true, true). Frenkel defects are favoured by a small cation and a large anion (false).
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