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The Solid State — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe Solid State3 Marks
Question
Explain each of the following with a suitable example:
  1. Paramagnetism.
  2. Piezoelectric effect.
  3. Frenkel defect in crystals.
✓

Answer

  1. Paramagnetism: due to the presence of unpaired electron, these materials are attracted by a magnetic field e.g. $O_2,\ Cu^{2+},\ Fe^{3+}.$
  2. Piezoelectric effect: The crystals where dipoles may align themselves in an ordered manner such that there is a net dipole moment in the crystal, show electrical conductivity on application of pressure, e.g., lead zirconate, quartz, ammonium dihydrogen phosphate.
  3. Frenkel defect in crystals: In a Frenkel defect an ion leaves its position in the lattice and occupies an interstitial site, e.g.,$ AgCl,\  AgBr.$

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