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प्रश्न
Examine the given defective crystal:
Answer the following questions :
(i) What type of stoichiometric defect is shown by the crystal?
(ii) How is the density of the crystal affected by this defect?
(iii) What type of ionic substances show such defect?
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उत्तर
(i) Schottky defect is shown by the mentioned crystal, as equal number of cations and anions are missing in the crystal lattice.
(ii) This defect leads to decrease in density, as equal number of the cations and anions are missing from the crystal lattice.
(iii) This kind of defect is shown by those ionic substance in which the cations and anions are of almost similar sizes.
Examples: NaCl, KCl and CsCl.
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संबंधित प्रश्न
Explain the following term with suitable examples:
Frenkel defect
Give reasons : In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect.
Ionic solids containing large differences in sizes of ions show ____________.
Frenkel defects are not found in alkali metal halides because ____________.
The following diagram shows:
Schottky defect defines imperfection in the lattice structure of ____________.
In a Schottky defect ____________.
If NaCl is doped with 10–4 mole percent of SrCl2 the concentration of cation vacancies will be
Given below are two statements:
Statements I: Frenkel defects are vacancy as well as interstitial defects.
Statements II: Frenkel defect leads of colour in ionic solids due to the presence of F-centers.
Choose the most appropriate answer for the statements from the options given below:
Which type of ‘defect’ has the presence of cations in the interstitial sites?
