Question:
The yellow colour in $NaCl$ crystals is due to
The yellow colour in $NaCl$ crystals is due to
Updated On: Aug 1, 2022
- excitation of electrons in F-centres
- reflection of light from $Cl^-$ ions on the surface
- refraction of light from $Na^+$ ions
- all of the above
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The Correct Option is A
Solution and Explanation
The yellow colour is due to metal excess defect of anionic valency. $Na ^{+}$ion deposited on the surface of crystal of $NaCl$. The $Cl ^{-}$ion diffused to form $NaCl$. This happens by loss of electron from $Na$ to $Na ^{+}$at $F$ centres.
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