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  4. The yellow colour in NaCl crystals is due to

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Q. The yellow colour in $NaCl$ crystals is due to

AIIMSAIIMS 2015The Solid State

Solution:

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.