Heating of sodium chloride in the presence of sodium vapour creates F-centres which represent

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cationic vacancies

anionic vacancies

octahedral voids

tetrahedral voids

answer is B.

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Detailed Solution

F-centres are anionic vacancies.

Anionic vacancies exist in alkali halides like NaCl and KCl. At this defect, the negative ion is missing from the lattice site, leaving a hole that an electron fills to maintain the balance of the electric field.

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