Question:
Identify the defect that develops when the ratio of number of cations to anions become different from that indicated by its chemical formula.
Identify the defect that develops when the ratio of number of cations to anions become different from that indicated by its chemical formula.
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A defect that alters the stoichiometric ratio of ions is called a non-stoichiometric defect.
Updated On: Nov 13, 2026
- Schottky defect
- interstitial defect
- substitutional impurity defect
- nonstoichiometric defect
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Stoichiometric defects keep the ratio of cations to anions as in the formula, for example Schottky and Frenkel defects.
Step 2: Impurity and interstitial
Interstitial and substitutional impurity defects are other types where extra or foreign atoms occupy sites.
Step 3: Result
When the ratio of cations to anions differs from the chemical formula, it is a non-stoichiometric defect.
Final Answer:
It is a non-stoichiometric defect. \[ \boxed{\text{(D) }\text{nonstoichiometric defect}} \]
Stoichiometric defects keep the ratio of cations to anions as in the formula, for example Schottky and Frenkel defects.
Step 2: Impurity and interstitial
Interstitial and substitutional impurity defects are other types where extra or foreign atoms occupy sites.
Step 3: Result
When the ratio of cations to anions differs from the chemical formula, it is a non-stoichiometric defect.
Final Answer:
It is a non-stoichiometric defect. \[ \boxed{\text{(D) }\text{nonstoichiometric defect}} \]
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