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AP EAMCET20226 Jul 2022Morning ShiftChemistrySolid StateActual

F-centres are formed in NaCl crystal if it is heated with Na vapour. The above is due to

Options

  1. ASchottky defect
  2. BDislocation defect
  3. CMetal excess defect
  4. DMetal deficiency defect

Correct answer

C. Metal excess defect

Step-by-step solution

The crystal lattice has vacant anion sites, which are occupied by electrons. Anion sites occupied by electrons are called F -centres ( F 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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