# The correct statement regarding defects in a crystalline solid is: 1. Schottky defects have no effect on the density of crystalline solids. 2. Frenkel defects decrease the density of crystalline solids. 3. Frenkel defect is a dislocation defect. 4. Frenkel defect is found in halides of alkaline metals.

Subtopic:  Imperfections in Solids & Semiconductors |
78%
From NCERT
NEET - 2015
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The vacant space in the BCC lattice cell is:

1. 26%

2. 48%

3. 23%

4. 32%

Subtopic:  Voids, Radius Ratio & Coordination Number |
81%
From NCERT
NEET - 2015
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A given metal crystallizes out with a cubic structure having an edge length of 361 pm. If there are four metal atoms in one unit cell, the radius of one atom is:

1. 40 pm
2. 127 pm
3. 80 pm
4. 108 pm

Subtopic:  Density & Packing Fraction |
76%
From NCERT
NEET - 2015
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If a is the length of the side of a cube, the distance between the body-centered atom and one corner atom in the cube will be:

1. $\frac{2}{\sqrt{3}}a$

2. $\frac{4}{\sqrt{3}}a$

3. $\frac{\sqrt{3}}{4}a$

4. $\frac{\sqrt{3}}{2}a$

Subtopic:  Introduction & Crystal System |
65%
From NCERT
AIPMT - 2014
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A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72 g cm–3. The molar mass of the metal is:
(NA Avogadro's constant = 6.02 × 1023 mol–1)
1. 30 g mol–1
2. 27 g mol–1
3. 20 g mol–1
4. 40 g mol–1
Subtopic:  Density & Packing Fraction |
74%
From NCERT
AIPMT - 2013
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The number of carbon atoms per unit cell of a diamond is:

1. 8

2. 6

3. 1

4. 4

Subtopic:  Introduction & Crystal System |
59%
From NCERT
AIPMT - 2013
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A metal crystallizes with a fcc lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is:

1. 288 pm

2. 408 pm

3. 144 pm

4. 204 pm

Subtopic:  Density & Packing Fraction |
73%
From NCERT
AIPMT - 2012
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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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AB crystallizes in a body-centered cubic lattice with edge length 'a' equal to 387 pm. The distance between two oppositely charged ions in the lattice is:

1. 335 pm

2. 250 pm

3. 200 pm

4. 300 pm

Subtopic:  Density & Packing Fraction |
70%
From NCERT
AIPMT - 2010
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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 |
63%
From NCERT
AIPMT - 2009
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