Q63 / 200 · NEET 2006 · Chemistry

The appearance of colour in solid alkali metal halides is generally due to:

  • A
    interstitial positions
  • Correct answer
    B
    F-centres
  • C
    Schottky defect
  • D
    Frenkel defect

Solution

The appearance of colour in solid alkali metal halides is generally due to F-centres. Related Theory The anion sites occupied by electrons are called F-centre. An F-centre is a type of crystallographic defect in which an anionic vacancy in a crystal lattice is occupied by one or more unpaired electrons.

Hence, the correct answer is option: 'B'.

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