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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Copper metal has a face-centered cubic structure with the unit cell length equal to 0.361 nm. Picturing copper ions in contact along the face diagonal. The apparent radius of a copper ion is-

(A) 0.128                                         

(B) 1.42

(C) 3.22                                           

(D) 4.22

Subtopic:  Density & Packing Fraction |
 77%
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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 |
 79%
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A compound alloy of gold and copper crystallizes in a cube lattice in which the gold atoms occupy the lattice points at the corners of a cube and the copper atoms occupy the centres of each of the cube faces. The formula of this compound is-

(1) AuCu                                                   

(2) AuCu2

(3) AuCu3                                                 

(4) None of these 

Subtopic:  Density & Packing Fraction |
 77%
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