One mole crystal of a metal halide of the type MX with molecular weight 119 g having face centered cubic…

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 2.44gcm-3. The type of defect introduced during the recrystalization may be
  1. additional M+ and X- ions at interstitial sites
  2. Schottky defect
  3. F-centre
  4. Frenkel defect

Solution

Calculated density d=Z×moler massNa×volume=2.78 gcm-3
Is greater then actual density 2.44 gcm-3 therefore density decreases and defect is Schottky defect

Asked in: MHT CET Full Test 7

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