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JEE Advanced levelSingle correct optionDifficulty 3 of 3ss103

Assertion (A): A Frenkel defect does not alter the density of an ionic crystal. Reason (R): In a Frenkel defect the displaced cation moves to an interstitial site, so no ions leave the crystal and the volume is unchanged. Choose the correct option.

  1. ABoth A and R are true but R is not the correct explanation of A
  2. BA is true but R is false
  3. CA is false but R is true
  4. DBoth A and R are true and R is the correct explanation of A

Answer: D

In a Frenkel defect the number of ions and the volume stay the same, so density is unchanged. R states exactly this reason, so it explains A.
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