Which of the following is an incorrect statement?

  • A
    Stoichiometry of crystal remains unaffected due to Schottky defect.
  • B
    The coordination number is low for ions in ionic solids showing Frenkel defect.
  • C
    $F$-centre generation is responsible for imparting colour to the crystal.
  • D
    The density of crystal remains unaffected by the presence of Schottky defect.

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