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When NaCl crystal is heated in sodium va...

When NaCl crystal is heated in sodium vapors, then it attains yellow colour. It is due to

A

electrons trapped in cation vacancies

B

F-centres, which is electron trapped in anion vacancy created by `Cl^(-)`

C

F-centres, which is cation trapped in cation vacancy created by `Na^(+)`

D

interstitial defect caused by external impurity

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The correct Answer is:
B
When NaCl crystal is heated in sodium vapors, then it attains yellow colour. It is due to F-centres, which is electron trapped in anion vacancy created by `Cl^(-)`
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