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 |
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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 |
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Lithium borohydride (LiBH4),crystallises in an orthorhombic system with 4 molecules per unit cell. The unit cell dimensions are : a = 6.81Å, b= 4.43Å, c=7.17Å. If the molar mass of LiBH4 is 21.76 g mol–1. The density of the crystal is –

(1) 0.668 g cm–3

(2) 0.585 g cm2

(3) 1.23 g cm–3

(4) None

Subtopic:  Density & Packing Fraction |
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CsBr has a (bcc) arrangement and its unit cell edge length is 400 pm. Calculate the interionic distance in CsCl [CBSE 1993]

(1) 346.4 pm

(2) 643 pm

(3) 66.31 pm

(4) 431.5 pm

Subtopic:  Introduction & Crystal System | Density & Packing Fraction |
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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 |
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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 |
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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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