The diffraction of barium with X-radiation of wavelength 2.29Å gives a first – order reflection at 30°. What is the distance between the diffracted planes.

(1) 3.29 Å

(2) 4.39 Å

(3) 2.29 Å

(4) 6.29 Å

Subtopic:  Introduction & Crystal System |
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The vacant space in bcc lattice cell is ;


(a) 26%

(b) 48%

(c) 23%

(d) 32%

Subtopic:  Voids, Radius Ratio & Coordination Number |
 87%
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Copper crystallises in a face-centred cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm?

(1) 128
(2) 157
(3) 181
(4) 108

 

Subtopic:  Introduction & Crystal System |
 80%
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Lithium metal crystallizes in a body centered cubic crystal. If the length of the side of the unit cell of lithium is 351 pm, the atomic radius of the lithium will be - 

1. 240.8 pm

2. 151.8 pm

3. 75.5 pm

4. 300.5 pm

Subtopic:  Introduction & Crystal System |
 88%
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NEET - 2009
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If 'a' stands for the edge length of the cubic systems: simple cubic, body centered cubic and face centered cubic, then the ratio of radii of the spheres in these systems will be respectively,

(a) 12a: 34a:122a     (b) 12a:3a:12a(c) 12a:32a:22a        (d) 1a:3a:2a

Subtopic:  Introduction & Crystal System |
 91%
From NCERT
NEET - 2008
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Which of the following statements is not correct?

(a) The fraction of the total volume occupied by the atoms in a primitive cell is 0.48

(b) Molecular solids are generally volatile

(c) The number of carbon atoms in an unit cell of diamond is 8

(d) The number of Bravais lattices in which a crystal can be categorized is 14

Subtopic:  Imperfections in Solids & Semiconductors |
 69%
NEET - 2006
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Sodium metal crystallizes in bcc lattice with cell edge =4.29 A0. The radius of sodium atom will be-

(1) 1.50 A0                                                 

(2) 1.86  A0

(3) 2.80 A0                                               

(4) None of these 

Subtopic:  Density & Packing Fraction |
 82%
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A metallic element exists as cubic lattice. Each edge of the unit cell is 2.88 A0. The density of the metal is 7.20 g cm-3. How many unit cell will be present in 100 g of the metal -

(A) 6.85×102                             

(B) 5.82×1023

(C) 4.37×105                             

(D) 2.12×106

Subtopic:  Density & Packing Fraction |
 60%
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Fraction of total volume occupied by atoms in a simple cube is-

(1) π2                                   

(2) 3π8

(3) 2π6                             

(4) π6

Subtopic:  Density & Packing Fraction |
 85%
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Analysis shows that an oxide ore of  nickel has formula  Ni0.98O1.00. The percentage of nickel as Ni3+ ions is nearly

1. 2

2. 96

3. 4.08

4. 98

Subtopic:  Density & Packing Fraction |
 65%
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