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Question
Give reasons : In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect.
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Solution
Schottky defect is shown by the ionic solids having very small difference in their cationic and anionic radius whereas Frenkel defect is shown by ionic solids having large difference in their cationic and anionic radius. In this case the radius of both Na+ and Cl- have very small difference in their radius as a result of it NaCl will show schottky defect.
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RELATED QUESTIONS
Explain the following term with suitable examples:
Frenkel defect
Explain the following term with a suitable example:
Interstitials
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(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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The radius of Cs+ is 169 pm and Cl− is 181 pm. The radius ratio is ____________.
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Cations are present in the interstitial sites in ______.
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Match the defects given in Column I with the statements in given Column II.
| Column I | Column II |
| (i) Simple vacancy defect | (a) shown by non-ionic solids and increases density of the solid. |
| (ii) Simple interstitial defect | (b) shown by ionic solids and decreases density of the solid. |
| (iii) Frenkel defect | (c) shown by non ionic solids and density of the solid decreases. |
| (iv) Schottky defect | (d) shown by ionic solids and density of the solid remains the same. |
Schottky defect is noticed in ______
