The correct statement regarding F-centre is | vedclass

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(D) $F$-centres are formed when anionic vacancies are occupied by unpaired electrons. $1$. These electrons are trapped in the voids of the crystal lat

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All of the above

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(D) $F$-centres are formed when anionic vacancies are occupied by unpaired electrons. $1$. These electrons are trapped in the voids of the crystal lattice. $2$. They absorb energy from visible light,which imparts colour to the crystals. $3$. The presence of these free electrons increases the electrical conductivity of the crystal. Therefore,all the given statements are correct.

The correct statement regarding $F$-centre is

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