F-centres in an ionic crystal are:

lattice sites containing electrons

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interstitial sites containing electrons

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lattice sites that are vaccant

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interstitial sites containing cations

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Solution

The correct option is A lattice sites containing electrons
F-center is a type of crystallographic defect in which an anionic vacancy in a crystal is filled by one or more unpaired electrons. Therefore, F-centers are lattice sites containing electrons.
Answer: (A) lattice sites containing electrons

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