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Question

Which of the following statement(s) is/are correct?


  1. Schottky defect lowers the density

  2. Frenkel defect increases the dielectric constant of the crystals

  3. Stoichiometric defects make the crystals electrical conductors

  4. In Schottky defect, an equal number of extra cations and electrons are present in the interstitial sites


Solution

The correct options are
A

Schottky defect lowers the density


B

Frenkel defect increases the dielectric constant of the crystals


C

Stoichiometric defects make the crystals electrical conductors


Schottkey defects are point defects where vacancies are formed. These reduce the density of solids. Frenkel defects are dislocation defects where ions occupy interstetial spaces. This makes the substance a better dielectric.

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