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JEE Main levelOne or more correct optionsDifficulty 2 of 3ss101

Which statements about point defects in ionic solids are correct?

  1. AA Schottky defect is favoured when cation and anion sizes are similar and the coordination number is high.
  2. BA Schottky defect lowers the density of the crystal.
  3. CFrenkel defects are common in NaCl.
  4. DA Frenkel defect leaves the density unchanged.

Answer: A, B, D

Schottky defects remove ion pairs, so density falls; they occur in NaCl, CsCl and similar solids with high CN and similar ion sizes. Frenkel defects move an ion to an interstitial site, so density is unchanged; they occur when the cation is much smaller (AgBr, ZnS), not in NaCl.
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