1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion: The presence of a large number of Schottky defects in NaCl lowers its density. Reason: In NaCl, there are approximately 106 Schottky pairs per cm3 at room temperature.

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Q. Assertion: The presence of a large number of Schottky defects in $NaCl$ lowers its density.
Reason: In NaCl, there are approximately $10^6$ Schottky pairs per $cm^3$ at room temperature.

AIIMSAIIMS 2013The Solid State

Solution:

When an atom or an ion is missing from its normal lattice site, a lattice vacancy or defect is created, which is called Schottky defect. Due to missing density of crystal will be lowered.