Frenkel defect is not found in the halides of alkali metals because alkali metals have

1. high electropositivity

2. high ionic radii

3. high reactivity

4. ability to occupy interstitial sites

Subtopic:  Voids, Radius Ratio & Coordination Number |
 57%
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Iodine crystals are classified as-

1. Metallic solids.                                  

2. Ionic solids.

3. Molecular solids .                                 

4. Covalent solids.

Subtopic:  Introduction & Crystal System |
 67%
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A solid PQ have rock salt type structure in which Q atoms are at the corners of the unit cell. If the body centred atoms in all the unit cells are missing, the resulting stoichiometry will be-

(A) PQ                                               

(B) PQ2

(C) P3Q4                                             

(D) P4Q3

 

Subtopic:  Introduction & Crystal System | Voids, Radius Ratio & Coordination Number |
 50%
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At room temperature, sodium crystallizes in a body-centered cubic cell with a 4.24 A0. The theoretical density of sodium is- (Atomic mass of sodium=23.0 g mol-1)

(A) 2.05 g cm-3                                         

(B) 3.45 g cm-3

(C) 1.00 g cm-3                                         

(D) 3.55 g cm-3

Subtopic:  Density & Packing Fraction |
 71%
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Which is amorphous solids-

(1) Rubber                                       

(2) Plastic

(3) Glass                                         

(4) All

Subtopic:  Introduction & Crystal System |
 90%
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In the unit cell of an fcc system, the number of octahedral and tetrahedral holes are

(1) 4,4                                                 

(2) 4, 8

(3) 1, 8                                             

(4) 4, 1

Subtopic:  Voids, Radius Ratio & Coordination Number |
 94%
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If Xenon crystallizes in face center cubic lattice and the edge of the unit cell is 620 pm, then the radius of the Xenon atom is-

1. 219.20 pm                                   

2. 438.5 pm

3. 265.5 pm                                     

4. 536.94 pm

Subtopic:  Voids, Radius Ratio & Coordination Number |
 79%
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The unit cell of a metallic element of atomic mass 108 and density 10.5 g/cm2 is a cube with edge length of 409 pm. The structure of the crystal lattice is-

(1) fcc                                                         

(2) bcc

(3) hcp                                                       

(4) None of these

Subtopic:  Density & Packing Fraction |
 74%
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In a cubic unit cell, atom A is present at each corner, atom B at each face centre and atom C at the body centre. The simplest formula of the solid is :

1. AB2C                                         

2. A2BC

3. AB3C                                         

4. ABC3

Subtopic:  Voids, Radius Ratio & Coordination Number |
 85%
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The unit cell dimensions of a cubic lattice (edges a, b, c and the angles between them, α, β, γ) are : 

1. a = b = c, α β γ 90°

2. a = b ≠ c, α β γ 90°

3. a = b = c, α γ 90°, β ≠ 90°

4. a ≠ ≠ c, α β 90°, γ ≠ 90°

Subtopic:  Introduction & Crystal System |
 94%
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