Question:
Which of the following ionic crystals exhibits Schottky defect?
Which of the following ionic crystals exhibits Schottky defect?
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Schottky defects occur in strongly ionic crystals where cation and anion have similar size, such as NaCl.
Updated On: Nov 12, 2026
- Sodium chloride
- Calcium fluoride
- Silver chloride
- Silver iodide
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
A Schottky defect is the loss of equal numbers of cations and anions from their sites, keeping the crystal neutral and lowering its density.
Step 2: Where it occurs
It is found in strongly ionic solids with high coordination number where cation and anion are of similar size.
Step 3: Compare the options
NaCl fits this requirement.
AgCl and AgI have a big size difference between ions and mainly show the Frenkel defect, where an ion moves to an interstitial site.
Final Answer:
Sodium chloride shows the Schottky defect. \[ \boxed{\text{(A) }\text{Sodium chloride}} \]
A Schottky defect is the loss of equal numbers of cations and anions from their sites, keeping the crystal neutral and lowering its density.
Step 2: Where it occurs
It is found in strongly ionic solids with high coordination number where cation and anion are of similar size.
Step 3: Compare the options
NaCl fits this requirement.
AgCl and AgI have a big size difference between ions and mainly show the Frenkel defect, where an ion moves to an interstitial site.
Final Answer:
Sodium chloride shows the Schottky defect. \[ \boxed{\text{(A) }\text{Sodium chloride}} \]
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