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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ss046

Which of the following statements about point defects are correct?

AA Schottky defect lowers the density of an ionic crystal.
BA Frenkel defect does not change the density of the crystal.
CFrenkel defects are favoured by a high coordination number of the ions.
DAdding $SrCl X_{2}$ to NaCl creates one cation vacancy for every $Sr X^{2 +}$ ion.

Answer: A, B, D

Schottky defects remove ions from the crystal, so mass per volume falls; Frenkel defects only move an ion, leaving density unchanged. Frenkel defects are favoured by low coordination number (open structures) and a size difference of ions. Each

Sr X^{2 +}

replaces two

Na X^{+}

ions in charge terms, creating one vacancy.

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