Why are crystals having F-centres paramagnetic?

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Solution

Free, unpaired electrons occupying anionic vacancies undergo spin in a particular direction which produces magnetic moment and hence, ionic crystals with F-centres show paramagnetic behaviour.

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Which of the following crystals can exhibit paramagnetic property

Q. Assertion :Solids containing F-centres are paramagnetic. Reason: F-centres solids possess holes occupied by unpaired electrons.

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