Why does table salt,NaCl,sometimes appear yel | vedclass

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(B) The yellow colour of $NaCl$ crystals is due to the metal excess defect caused by anion vacancies.When $NaCl$ crystals are heated in an atmosphere

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Due to metal excess defect caused by anion vacancies

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(B) The yellow colour of $NaCl$ crystals is due to the metal excess defect caused by anion vacancies.When $NaCl$ crystals are heated in an atmosphere of sodium vapour,sodium atoms are deposited on the surface of the crystal.$Cl^-$ ions diffuse to the surface and combine with $Na$ atoms to form $NaCl$.This process creates anionic vacancies in the crystal lattice,which are occupied by electrons to maintain electrical neutrality.These trapped electrons are known as $F$-centres.When these electrons absorb energy from the visible region of light,they get excited and impart a yellow colour to the $NaCl$ crystals.

Why does table salt,$NaCl$,sometimes appear yellow in colour?

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