CsBr crystallises in a body-centered cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 amu and that of Br = 80 amu and the Avogadro number being 6.02×1023 mol-1, the density of CsBr is:

1. 42.5 g/cm3

2. 0.425 g/cm3

3. 8.25 g/cm3

4. 4.25 g/cm3

Subtopic:  Introduction & Crystal System |
From NCERT
AIPMT - 2006
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A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75 % of octahedral voids. The formula of the compound is:

1. C3A4

2. C2A3

3. C3A2

4. C4A3

Subtopic:  Voids, Radius Ratio & Coordination Number |
 51%
From NCERT
NEET - 2019
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Ionic radii of Mg2+ and O2- ions are 66 pm and 140 pm respectively. The type of interstitial void and coordination number of Mg2+ ion respectively are


1. Tetrahedral, 12

2. Octahedral, 6

3. Tetrahedral, 6

4. Octahedral, 8

Subtopic:  Voids, Radius Ratio & Coordination Number |
 68%
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An element crystallizes in a structure having FCC unit cell of an edge length 200 pm. If
200 g this element contains 24 x 1023 atoms, the density of the element is

1. 50.3 g/cc

2. 63.4 g/cc

3. 41.6 g/cc

4. 34.8 g/cc

Subtopic:  Density & Packing Fraction |
 79%
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For a cubic crystal structure, which one of the following relations indicating the cell characteristic is correct?

1. abc and αβ and γ90°

2. abc and α=β = γ=90°

3. a=b=c and αβ = γ=90°

4. a=b=c and α=β= γ=90°

Subtopic:  Introduction & Crystal System |
 86%
From NCERT
AIPMT - 2007
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Silicon gives p-type of semiconductor on doping with:

1. Germanium.

2. Arsenic.

3. Selenium.

4. Boron.

Subtopic:  Imperfections in Solids & Semiconductors |
 73%
From NCERT
AIPMT - 2008
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The percentage of free space in a body-centered cubic unit cell is:

1. 30%
2. 32%
3. 34%
4. 28%
Subtopic:  Density & Packing Fraction |
 88%
From NCERT
AIPMT - 2008
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If the lattice parameter for a crystalline structure is 3.6 Å, then the atomic radius in fcc crystal is: 

1. 1.81 Å

2. 2.10 Å

3. 2.92 Å

4. 1.27 Å

Subtopic:  Density & Packing Fraction |
 75%
From NCERT
AIPMT - 2008
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Sodium has body-centered packing. The distance between the two nearest atoms is 3.7 Å. The lattice parameter is:
1. 6.8 Å
2. 4.3 Å
3. 3.0 Å
4. 8.5 Å
Subtopic:  Density & Packing Fraction |
 64%
From NCERT
AIPMT - 2009
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The number of octahedral void(s) per atom present in a cubic close-packed structure is: 

1. 1

2. 3

3. 2

4. 4

Subtopic:  Voids, Radius Ratio & Coordination Number |
From NCERT
AIPMT - 2012
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