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Heating NaCl in sodium vapour gives it a colour because of which defect?
AFrenkel interstitial defect
BSchottky vacancy pair defect
CAnion vacancies (F-centres)
DCation vacancy only defect
Answer & Solution
Correct answer: C. Anion vacancies (F-centres)
Electrons trapped in anion vacancies, called F-centres, absorb light and colour the crystal.
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