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Q.

When NaCl is heated in presence of sodium vapour, it becomes yellow coloured due to

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a

Frenkel defect

b

Metal deficiency defect

c

Schottky defect         

d

Metal excess 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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