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  4. Assertion: No compound has both Schottky and Frenkel defects. Reason: Both defects change the density of the solid.

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Q. Assertion: No compound has both Schottky and Frenkel defects.
Reason: Both defects change the density of the solid.

AIIMSAIIMS 2008

Solution:

Certain ionic solids (for example, $AgBr$ ) have both Schottky and Frenkel defects. Only Schottky defects change the density of solids because anions or cations are missing and Frenkel defects have no change in density because they have same number of cations or anions, only change the position of ions.