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Question
What type of defect is shown by NaCl in
stoichiometric defects, and
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Solution
NaClshows vacancy or schottky defect in case of stoichiometric defect.
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RELATED QUESTIONS
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?
Out of NaCl and AgCl, which one shows Frenkel defect and why?
Defects in solids can be studied using
The radius of Cs+ is 169 pm and Cl− is 181 pm. The radius ratio is ____________.
Schottky defect defines imperfection in the lattice structure of ____________.
Which is not correct about the Schottky defects?
Alkali halids do not show Frenkel defect because ____________.
Which of the following defects is also known as dislocation defect?
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. |
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.
