The unit cell dimensions of a cubic lattice (edges a, b, c and the angles between them, α, β, γ) are : 

1. a = b = c, α β γ 90°

2. a = b ≠ c, α β γ 90°

3. a = b = c, α γ 90°, β ≠ 90°

4. a ≠ ≠ c, α β 90°, γ ≠ 90°

Subtopic:  Introduction & Crystal System |
 94%
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Select the correct option based on statements below:
Assertion (A): The total number of atoms present in a simple cubic unit cell is one.
Reason (R): Simple cubic unit cell has atoms at its corners, each of which is shared between eight adjacent unit cells.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  Introduction & Crystal System |
 86%
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Select the correct option based on statements below:

Assertion (A): The stability of a crystal is reflected by the magnitude of its melting point.
Reason (R): Greater the intermolecular forces of attraction, the higher will be the stability and melting point of the substance.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Introduction & Crystal System |
 87%
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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 |
 84%
From NCERT
AIPMT - 2009
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The incorrect statement among the following regarding crystalline solid is -

1. Definite and characteristic heat of fusion.
2. Isotropic nature.
3. A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal.
4. A true solid.

Subtopic:  Introduction & Crystal System |
 84%
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Network solid, among the following, is :

1. SO2(solid)

2. I2

3. Diamond

4. H2O(ice)

Subtopic:  Introduction & Crystal System |
 83%
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The coordination number of a square close-packed structure in two dimensions is -

1. 2

2. 3

3. 4

4. 6

Subtopic:  Introduction & Crystal System |
 76%
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The correct statement(s) among the above is -
a. The coordination number of a cation occupying a tetrahedral hole is 4.
b. The coordination number of a cation occupying an octahedral hole is 6.
c. In Schottky defect, the density of the lattice decreases.

1. a, b                                         

2. b, c

3. a, b, c                                     

4. a, c

Subtopic:  Introduction & Crystal System |
 75%
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Incorrect statement among the following about amorphous solids is -

1. On heating they may become crystalline at a certain temperature.
2. They may become crystalline on keeping for a long time.
3. Amorphous solids can be moulded by heating.
4. They are anisotropic in nature.

Subtopic:  Introduction & Crystal System |
 77%
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An example of amorphous solid among the following is -

1. Graphite (C)

2. Quartz glass (SiO2)

3. Chrome alum

4. Silicon carbide (SiC)

Subtopic:  Introduction & Crystal System |
 77%
From NCERT
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