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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 a suitable example:
Interstitials
Give reasons : In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect.
Defects in solids can be studied using
Type of stoichiometric defect shown by AgBr is ____________.
The following diagram shows:
Alkali halids do not show Frenkel defect because ____________.
In a Schottky defect ____________.
Which of the following defects is also known as dislocation defect?
Frenkel defect is also known as:
(i) stoichiometric defect
(ii) dislocation defect
(iii) impurity defect
(iv) non-stoichiometric defect
Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion: In any ionic solid (MX) with Schottky defects, the number of positive and negative ions are same.
Reason: Equal number of cation and anion vacancies are present.
