Among the following types of voids. which one is the largest void:-

(A) Triangular system
(B) Tetragonal system
(C) Monoclinic system
(D) Octahedral

Subtopic:  Introduction & Crystal System | Voids, Radius Ratio & Coordination Number | Magnetic Behaviour of an Element/Compound |
 77%
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The ratio of cations to anion in a closed pack tetrahedral is:

(a) 0.714
(b) 0.225
(c) 0.02
(d) none of these

Subtopic:  Voids, Radius Ratio & Coordination Number |
 84%
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The most efficient packing of similar spheres is obtained in 

1. the simple cubic system and the body centered cubic system

2. the simple cubic system and the hexagonal close packed system

3. the face centered cubic system and the hexagonal close packed system

4. the body centered cubic system and the face centered cubic system

Subtopic:  Density & Packing Fraction |
 79%
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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 |
 84%
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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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