Question:
F-centers are formed in \(NaCl\) crystal if it is heated with \(Na\) vapour. The above is due to
F-centers are formed in \(NaCl\) crystal if it is heated with \(Na\) vapour. The above is due to
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F-centers are electrons trapped in anion vacancies and are responsible for the color of many ionic crystals.
Updated On: Jun 25, 2026
- Schottky defect
- Dislocation defect
- Metal excess defect
- Metal deficiency defect
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The Correct Option is C
Solution and Explanation
Step 1: Understand F-centers.
F-centers are crystal defects produced due to the presence of electrons trapped in anion vacancies.
These trapped electrons impart color to the crystal.
Step 2: Formation of F-centers in \(NaCl\).
When \(NaCl\) is heated in sodium vapour: \[ Na \longrightarrow Na^+ + e^- \] The sodium atoms release electrons.
Chloride ions leave their lattice sites creating: \[ Cl^- \] vacancies.
The released electrons occupy these vacant anion sites.
Step 3: Identify the type of defect.
Because extra sodium atoms are effectively introduced into the crystal, there is an excess of metal ions compared to anions.
Thus, the defect produced is: Metal excess defect
Step 4: Final conclusion.
Hence, F-centers are formed due to \[ \boxed{\text{Metal excess defect}} \]
F-centers are crystal defects produced due to the presence of electrons trapped in anion vacancies.
These trapped electrons impart color to the crystal.
Step 2: Formation of F-centers in \(NaCl\).
When \(NaCl\) is heated in sodium vapour: \[ Na \longrightarrow Na^+ + e^- \] The sodium atoms release electrons.
Chloride ions leave their lattice sites creating: \[ Cl^- \] vacancies.
The released electrons occupy these vacant anion sites.
Step 3: Identify the type of defect.
Because extra sodium atoms are effectively introduced into the crystal, there is an excess of metal ions compared to anions.
Thus, the defect produced is: Metal excess defect
Step 4: Final conclusion.
Hence, F-centers are formed due to \[ \boxed{\text{Metal excess defect}} \]
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