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One mole crystal of a metal halide of the type MX with molecular weight 119 g having face centered cubic structure with unit cell length 6 .58 Å was recrystallized. The density of the recrystallized crystal was found to be 2.44 g c m - 3 . The type of defect introduced during the recrystalization may be

Options

  1. Aadditional M + and X - ions at interstitial sites
  2. BSchottky defect
  3. CF-centre
  4. DFrenkel defect

Correct answer

B. Schottky defect

Step-by-step solution

Calculated density d = Z × m o l e r m a s s N a × v o l u m e = 2.78 g c m - 3 Is greater then actual density 2.44 g c m - 3 therefore density decreases and defect is Schottky defect

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