The Solid State
Time: 30 Minute
- 1.Select the incorrect properties for amorphous solids
- A.
Their constituent particles are of irregular shapes and have short range order
- B.
They are isotropic in nature and melt over a range of temperature. Because of which they are also known as pseudo solids or super cooled liquids
- C.
When cut with a sharp-edged tool, they cut into two pieces with irregular surfaces
- D.
They have definite heat of fusion
- 2.Read the statements carefully and the select the correct options for the Hexagonal close-packing (i) Tetrahedral voids of the second layer are covered. (ii) Spheres of the third layer are exactly aligned with those of the first layer. (iii) Pattern is ABAB ....... type. (iv) Octahedral voids of the second layer are covered.
- A.
(i), (ii) and (iii)
- B.
(i), (ii)
- C.
(i), (iii)
- D.
(ii) and (iii)
- 3._________ are formed by the three dimensional arrangements of cations and anions bound by strong electrostatic forces.
- A.
Network Solids
- B.
Ionic Solids
- C.
Molecular Solids
- D.
Metallic Solids
- 4.If 'a' stands for the edge length of the cubic systems: simple cubic, body centred cubic and face centred cubic, then the ratio of the radii of the spheres in these systems will be respectively:
- A.
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- B.
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- C.
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- D.
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- 5.Percentage of free space in a body centred cubic unit cell is
- A.
32%
- B.
34%
- C.
28%
- D.
20%
- 6.The fraction of total volume occupied by the atoms present in a simple cube is
- A.
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- B.
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- C.
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- D.
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- 7.In diamond the coordination no. of carbon is ____ and its unit cell has____ carbon atoms.
- A.
4 and 8
- B.
4 and 6
- C.
6 and 4
- D.
4 and 4
- 8.The appearane of colour in solid alkali metal halides is generally due to
- A.
Schottky defect
- B.
Frenkel defect
- C.
Interstitial position
- D.
F-centresF-centres
- 9.In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells?
- A.
2
- B.
4
- C.
6
- D.
8
- 10.A compound formed by elements X and Y crystallizes in a cubic structure in which atoms X are at the corners of the cube and atoms Y are at the face-centers. The formula of the compound is
- A.
X3Y
- B.
XY
- C.
XY2
- D.
XY3
- 11.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 the unoccupied sites in sodium chloride crystal is
- A.
5.96
- B.
5.96 X 10-2
- C.
5.96 X 10-1
- D.
5.96 X 10-3
- 12.Match list I with list II and select the correct answer by using the codes given below: List I (Shape) List II (Radius ratio) 1. Planar triangle (A) 0.732 2. Square Planer (B) 0.225 3. Body Centered cubic (C) 0.115 4. Tetrahedral (D) 0.414
- A.
1 (C), 2(D), 3(A) and 4 (B)
- B.
1 (A), 2(C), 3(B) and 4 (D)
- C.
1 (A), 2(C), 3(D) and 4 (B)
- D.
1 (D), 2(A), 3(B) and 4 (C)
- 13.Coordination number of atoms in a cubic close-packed structure and in a body-centred cubic structure?
- A.
8.12
- B.
12, 8
- C.
4, 8
- D.
84
- 14.In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3 rd of tetrahedral voids. The formula of the compound will be
- A.
X3Y4
- B.
X4Y3
- C.
X2Y3
- D.
X2Y
- 15.Which one of the following comes under covalent solids
- A.
SiC, Graphite, Si
- B.
Plastic
- C.
LiBr , Ammonium phosphate
- D.
Brass, Rb
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