Frenkel defect is noticed in:

(a) AgBr

(b) ZnS

(c) Agl

(d) all of these

Subtopic:  Imperfections in Solids & Semiconductors |
 91%
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How many octahedral and tetrahedral holes are present per unit cell in a face centred cubic arrangement of atoms?

(1) 8,4

(2) 1.2

(3) 4.8

(4) 2.1

Subtopic:  Introduction & Crystal System |
 80%
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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)
Subtopic:  Imperfections in Solids & Semiconductors |
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An element (atomic mass = 100 g mole) having BCC structure has unit cell edge 400 Ao. The density of the element is (number of atom bcc(z)=2)

1. 2.144g/cm3
2. 5.2g/cm3
3. 7.289g/cm3
4. 10.376g/cm3

Subtopic:  Density & Packing Fraction |
 75%
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The appearance of color in solid alkali metal halides is generally due to:-

1. Frankel Defect

2. Interstitial Defect

3. F-Centres

4. Schottky Defect

Subtopic:  Imperfections in Solids & Semiconductors |
 90%
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AB crystallizers in a body-centred cubic lattice with edge length a equal to 387 pm. The distance between two oppositely charged ions in the lattice is

1. 250 pm

2. 200 pm

3. 300 pm

4. 335 pm

Subtopic:  Introduction & Crystal System |
 68%
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In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is -

1. AB2

2. A2B3

3. A2B5

4. A2B

Subtopic:  Voids, Radius Ratio & Coordination Number |
 78%
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Packing fraction of simple cubic crystal lattice is 

1. 38%

2. 74%

3. 68%

4. 52.4%

Subtopic:  Density & Packing Fraction |
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Silver metal crystallises in a cubic closest – packed arrangement with the edge of the unit cell having a length a = 407 pm. What is the radius of silver atom.

(1) 143.9 pm

(2) 15.6 pm

(3) 11.59 pm

(4) 13.61 pm

Subtopic:  Introduction & Crystal System | Density & Packing Fraction |
 81%
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Given that the length of the side of a unit cell of lithium is 351 pm, its atomic radius will be -

[Li forms Bcc crystals]

1. 153.69 pm

2. 62.71 pm

3. 151.98 pm

4. 54.61 pm

Subtopic:  Introduction & Crystal System |
 82%
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