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JEE Main · 2022 · 28 Jun 2022 · Shift 1 · Solid State

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The incorrect statement about the imperfections in solids is :
  1. (A)Schottky defect decreases the density of the substance.
  2. (B)Interstitial defect increases the density of the substance.
  3. (C)Frenkel defect does not alter the density of the substance.
  4. (D)Vacancy defect increases the density of the substance.✓ Correct

Answer: (D)

Solution

Vacancy defect occurs when an atom is missing from its lattice site, creating a void. This reduces the mass of the crystal without significantly changing the volume, thereby decreasing the density of the substance. The statement in option (D) that vacancy defect increases density is therefore incorrect.

For reference: Schottky defect (missing cation-anion pairs) decreases density; interstitial defect (extra atoms in voids) increases density; Frenkel defect (ion displaced to interstitial site) does not change density since no atoms are lost.

JEE Main · 2022 · 28 Jun 2022 · Shift 1 · Single correct option

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