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Question

Fcentres are :

A
the electrons trapped in anionic vacancies
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B
the electron trapped in cationic vacancies
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C
non-equivalent sites of stoichiometric compound
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D
All of the above
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Solution

The correct option is A the electrons trapped in anionic vacancies
F-centres or colour centres are points in a crystalline compound at which negative ion missing is replaced by one or more unpaired electrons.

Hence, they are electrons trapped in anionic vacancies.

Therefore, the option is A.

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