Question
Which of the following statements is true about schottky defect ?
MHT CET
Chemistry
Solid State
2026
MHT CET 2026 (19 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. The density of a substance decreases.
- B. The electrical neutrality of the substance changes.
- C. It is found in ionic compounds with larger difference between sizes of cation and anion.
- D. It develops when smaller cations occupy interstial sites from their normal sites.
Answer
A. The density of a substance decreases.
Step-by-step solution
Schottky defect is a type of point defect in a crystal lattice where an equal number of cations and anions are missing from their normal lattice sites. Since ions are missing from the crystal, the overall mass decreases while the volume remains unchanged, leading to a decrease in the density of the substance. Electrical neutrality is maintained because the number of missing positive and negative charges is equal. This defect is typically found in ionic compounds where the sizes of the cation and anion are almost similar (e.g., NaCl, KCl). The defect where smaller cations occupy interstitial sites is known as the Frenkel defect. Answer: The density of a substance decreases.
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