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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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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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
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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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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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The cations and anions are arranged in an alternate form in:

1. Metallic crystal

2. Ionic crystal

3. Co-valent crystal

4. Semi-conductor crystal

Subtopic:  Introduction & Crystal System |
 79%
From NCERT
AIPMT - 2000
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A cube of a crystal has an A-atom placed at every corner and B-atom placed at every centre of face. The formula of the compound is:

1. AB

2. AB3

3. A2B2

4. A2B3

Subtopic:  Introduction & Crystal System |
 86%
From NCERT
AIPMT - 2000
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In BCC, the distance between the two nearest atoms will be:

1. 3 a

2. 32a

3. 34a

4. a2

Subtopic:  Density & Packing Fraction |
 73%
AIPMT - 2001
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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 number of atoms per unit cell in a BCC structure is:

1. 9

2. 4

3. 2

4. 1

Subtopic:  Introduction & Crystal System |
 79%
From NCERT
AIPMT - 2002
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