Published by:
CGP EDU Academic Team
Published on: August 13, 2026
F-centres are formed in 
crystal if it is heated with 
vapour. The above is due to
Text Solution
Verified by ExpertsThe correct answer is:
C
The crystal lattice has vacant anion sites, which are occupied by electrons. Anion sites occupied by electrons are called F-centres ( 
is abbreviated from Farbe, the German word for colour. These F-centres are associated with the colour of the compound and the more F-centres present, the greater the intensity of the coloration. F-centre containing solids are paramagnetic, photoconductors:
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