A) an ion leaves its normal site and occupies an interstitial site
B) unequal number of cations and anions are missing from the lattice
C) density of the crystal is increased
D) equal number of cations and anions are missing from the lattice
Correct Answer: D
Solution :
Schottky defect in crystals is observed when equal number of cations and anions are missing from the lattice. So, the crystal remains neutral e.g., NaCl and the density of the crystal decreases.
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