What type of crystal defects is indicated in the diagram given below?
1. Frenkel and Schottky defects
2. Schottky defect
3. Interstitial defect
4. Frenkel defect
Frenkel defect is noticed in:
1. AgBr
2. ZnS
3. Agl
4. All of the above
Schottky defect occurs mainly in electrovalent compounds where :
1. Positive ions have large sizes.
2. Negative ions have small sizes.
3. Positive and negative ions are of similar size.
4. Positive ions are big and negative ions are small.
The appearance of color in solid alkali metal halides is generally due to:-
1. Frenkel Defect
2. Interstitial Defect
3. F-Centres
4. Schottky Defect
Which is the incorrect statement?
(1) has non-stoichiometric metal deficiency defect
(2) Density decreases in case of crystals with Schottky's defect
(3) NaCI(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezoelectric crystal
(4) Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal
The correct statement regarding defects in the crystalline solid is
1. Schottky defects have no effect on the density of crystalline solids
2. Frenkel defects decreases the density of crystalline solids
3. Frenkel defcct is a dislocation defect
4. Frenkel defect is found in halides of alkaline metals
Choose the correct matching sequence from the possibilities given
(a) Crystal defect | (i) AB AB AB. . . . type crystal |
(b) hcp | (ii) Covalent crystal |
(c) CsCl | (iii) Frenkel |
(d) Diamond | (iv) Face centered in cube |
(e) NaCl | (v) Body centered in cube |
(a) | (b) | (c) | (d) | (e) | |
(1) | (iii) | (i) | (ii) | (v) | (iv) |
(2) | (iii) | (i) | (v) | (ii) | (iv) |
(3) | (iii) | (v) | (i) | (ii) | (iv) |
(4) | (v) | (iii) | (iv) | (ii) | (i) |
Silicon gives p-type of semiconductor on doping with:
1. Germanium.
2. Arsenic.
3. Selenium.
4. Boron.
A compound that shows Schottky as well as Frenkel defect among the following is -
1. ZnS
2. AgBr
3. NaCl
4. AgCl