What type of crystal defect is indicated in the diagram below? 

 

  1. A

    Interstitial defect 

  2. B

    Schottky defect 

  3. C

    Frenkel defect  

  4. D

    Frenkel & Schottky defects  

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    Solution:

    When an atom or ion is missing from its normal lattice site, a lattice vacancy is created. This defect is known as Schottky defect. Here equal number of Na+ and Cl ions are missing from their regular lattice position in the crystal. So it is Schottky defect.

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