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प्रश्न
Why are crystals having F-centres paramagnetic?
लघु उत्तरीय
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उत्तर
- An F-centre (short for Farbe centre, meaning “colour centre”) forms when an anion (like Cl−) is missing from its lattice site, and the vacancy is occupied by an unpaired electron.
- These unpaired electrons are free to align with an external magnetic field.
- Since paramagnetism arises due to unpaired electrons, crystals with F-centres exhibit paramagnetic behaviour.
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