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Schottky defect lowers the density of the crystal because
Aions move to interstitial sites (typical)
Bextra electrons enter holes
Clattice expands due to heat
Dequal numbers of cations and anions are missing
Answer & Solution
Correct answer: D. equal numbers of cations and anions are missing
1. In a Schottky defect, pairs of one cation and one anion are missing from lattice sites.
2. The mass decreases while the unit-cell volume is essentially unchanged.
3. Density = mass/volume falls, so the crystal becomes slightly less dense.
_Source: Maharashtra Balbharati Std XII Chemistry, Ch 1 "Solid State" §1.10_
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