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Question

F-centres in an ionic crystal are:

A
lattice sites containing electrons
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B
interstitial sites containing electrons
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C
lattice sites that are vaccant
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D
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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