Q.
When NaCl is heated in presence of sodium vapour, it becomes yellow coloured due to
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a
Schottky defect
b
Frenkel defect
c
Metal excess defect
d
Metal deficiency defect
answer is C.
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Detailed Solution
This is due to metal excess defect. It is due to anionic vacancies and by the presence of extra cations in the interstitial sites.
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