Advertisements
Advertisements
प्रश्न
What type of defect is shown by NaCl in
stoichiometric defects, and
Advertisements
उत्तर
NaClshows vacancy or schottky defect in case of stoichiometric defect.
APPEARS IN
संबंधित प्रश्न
Explain the following term with suitable examples:
Frenkel defect
Explain the following term with a suitable example:
Interstitials
Answer the following question.
What type of stoichiometric defect is shown by ZnS and why?
Frenkel defects are not found in alkali metal halides because ____________.
Which is not correct about the Schottky defects?
Schottky defect is observed in crystals when ______.
Which of the following statements are not true?
(i) Vacancy defect results in a decrease in the density of the substance.
(ii) Interstitial defects results in an increase in the density of the substance.
(iii) Impurity defect has no effect on the density of the substance.
(iv) Frankel defect results in an increase in the density of the substance.
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.
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:
