Which of the following conditions favours the existence of a substance in the solid state?

1.  High temperature

2.  Low temperature

3.  High thermal energy

4.  Weak cohesive forces

 

Subtopic:  Introduction & Crystal System |
 62%
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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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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%
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Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substances? 

1.      

2.      

3.      

4.      

Subtopic:  Magnetic Behaviour of an Element/Compound |
 79%
From NCERT
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Which of the following is true about the value of refractive index of quartz glass?

1. Same in all directions

2. Different in different directions

3. Cannot be measured

4. Always zero

 

Subtopic:  Introduction & Crystal System |
 73%
From NCERT
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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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The sharp melting point of crystalline solids is due to......... .

1. A regular arrangement of constituent particles observed over a short distance in the crystal lattice
2. A regular arrangement of constituent particles observed over a long distance in the crystal lattice
3. Same arrangement of constituent particles in different directions
4. Different arrangement of constituent particles in different directions

Subtopic:  Introduction & Crystal System |
 74%
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Iodine molecules are held in the crystals lattice by ........ .

1.  London forces.

2.  Dipole-dipole interactions.

3.  Covalent bonds.

4.  Coulombic forces.

 

Subtopic:  Introduction & Crystal System |
 63%
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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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I. Mg(s)

II. TiO(s)

III. I2(s)

IV. H2O(s)

The insulator among the given examples is -

1. Only I

2. Only II

3. III and IV

4. II, III, and IV

Subtopic:  Imperfections in Solids & Semiconductors |
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