# Zn converts its melted state to its solid state. It has an HCP structure. The number of the nearest atom is: 1. 6 2. 8 3. 12 4. 4

Subtopic:  Voids, Radius Ratio & Coordination Number |
62%
From NCERT
AIPMT - 2001
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The pyknometric density of sodium chloride crystal is 2.165 × 103 kg m–3 while its X-ray density is 2.178 × 103 kg m–3. The fraction of unoccupied sites in sodium chloride crystal is:

1. 5.96

2. 5.96 × 10–2

3. 5.96 × 10–1

4. 5.96 × 10–3

Subtopic:  Density & Packing Fraction |
From NCERT
AIPMT - 2003
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In BCC, the distance between the two nearest atoms will be:

1. $\sqrt{3}$ $a$

2. $\frac{\sqrt{3}}{2}a$

3. $\frac{\sqrt{3}}{4}a$

4. $\frac{a}{2}$

Subtopic:  Density & Packing Fraction |
73%
AIPMT - 2001
Hints

MgO and NaCl has similar structure. In MgO, magnesium is surrounded by how many oxygen atoms?
1. 2
2. 4
3. 6
4. 1

Subtopic:  Introduction & Crystal System |
57%
From NCERT
AIPMT - 1999
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A compound formed by elements X and Y crystallizes in a cubic structure in which the X atoms are at the corners of a cube and the Y atoms are at the face centers. The formula of the compound is:

1. X3Y

2. XY

3. XY2

4. XY3

Subtopic:  Density & Packing Fraction |
83%
From NCERT
AIPMT - 2004
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On the basis of unit cell concept a crystal has:

1. 7 systems
2. 14 systems
3. 230 systems
4. 32 systems

Subtopic:  Introduction & Crystal System |
50%
From NCERT
AIPMT - 1999
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The number of atoms per unit cell in a BCC structure is:

1. 9

2. 4

3. 2

4. 1

Subtopic:  Introduction & Crystal System |
80%
From NCERT
AIPMT - 2002
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The second order Bragg diffraction of X-rays with λ = 1.00 Å from a set of parallel planes in a metal occurs at an angle $60°$. The distance between the scattering planes in the crystal is:

1.  2.00 Å
2.  1.00 Å
3.  0.57 Å
4.  1.15 Å

Subtopic:  Introduction & Crystal System |
AIPMT - 1998
Hints

The edge length of a face centered unit cubic cell is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is:
1. 144 pm
2. 398 pm
3. 288 pm
4. 618 pm

Subtopic:  Voids, Radius Ratio & Coordination Number |
51%
From NCERT
AIPMT - 1998
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Schottky defect shows:

 1 Same number of cation and anions decrease from lattice. 2 Cations and anions are replaced from their sites. 3 Maximum number of cations and anions are same. 4 None of the above.

Subtopic:  Imperfections in Solids & Semiconductors |
81%
From NCERT
AIPMT - 1998
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