Question

The correct statement regarding $F-$centre is:

• A. Electron are held in the voids of crystals
• B. $F-$centre produces colour to the crystals
• C. Conductivity of the crystal increases due to $F-$centre
• D. All of the above

Answer 1

Answer: (D)

All of the above

$F-$ centre is a type of crystallographic defect in which an anionic vacancy in a crystal is filled by one or more unpaired electron, depending on the charge of the missing ion in the crystal.

These unpaired electrons produces colour in the crystal by absorbing light in the visible spectrum.

The unpaired electron acts as charge carriers and hence the crystal conducts electricity.

Hence, option D is correct.