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1. Which of the following compounds has hexagonal structure?
Diamond
Graphite
NaCl
KCl.
2. Rate of evaporation of a liquid does not depend upon
nature of liquid
temperature
Atmospheric pressure
Size of vessel.
3. Which of the following is not a property of crystalline solid?
Isotropy
Anisotropy
Sharp melting point
Definite geometry.
4. In a face centred cubic lattice the number of nearest neighbours for a given lattice point is
6
4
8
12
5. NaCl is an example of
ionic solid
covalent solid
metallic solid
molecular solid.
6. In rock salt structure what percentage of the octahedral voids are occupied by cations?
50%
100%
25%
33%.
7. Which of the following compounds is an example of network solid?
Corrundum
Carborundum
Dry ice
Ice.
8. The number of octahedral and tetrahedral voids per sphere in a cubic close packed arrangement is respectively.
1 and 3
6 and 4
1 and 2
2 and 1.
9. A simple cubic lattice consists if eight identical spheres of Radius R in contact placed at the corners of the cube what fraction of the total volume of cube is actually occupied by the cube?
74%
68%
52.40%
66%.
10. When a cation leaves its normal position in the crystal and moves to some interstitial space the defect in the crystal is known as
Schottky defect
F-centre
Frenkel defect
Non-stochiometric defect.
11. What type of defect creates F-centres in the crystal?
Non-stoichiometric defect
Metal excess defect due to anion vacancies
Metal excess defect due to extra cation
Frenkel defect.
12. A crystal may have one or more planes of symmetry as well as one or more than one axis of symmetry but it has only no centre of symmetry.
two centres of symmetry
one centre of symmetry
four centres of symmetry
no centre of symmetry
13. During evaporation of liquid
temperature of liquid will rise
temperature of liquid will fall
temperature of liquid may rise or fall depending upon its nature
temperature of liquid remains unaffected.
14. hich of the following is an example of molecular solid?
ZnS
MgO
Ice
Diamond.
15. Which of the following is hcp crystal structure?
NaCl
CsCl
Zn
RbCl.
16. When electrons are trapped in the crystal lattice in place of anion vacancy the defect in the crystal is known as
Frenkel defect
Schottky defect
F-centre
Dislocations.
17. A match box exhibits
cubic geometry
rectangular geometry
orthorhombic geometry
monoclinic geometry.
18. The percentage of the available space occupied in a hexagonal close packing of spheres in three dimensions is
76%
26%
52.40%
74%.
19. Which type of silicates involve sharing of two oxygen atoms between silicon atoms?I. single chain silicate II. ring silicateIII. sheet silicate IV. double chain silicate.
I III
I II
III IV
III VI
20. A binary solid AB having radius ratio 0.52 is most likely to have
zinc blende structure
rock-salt structure
fluorite structure
antifluorite structure.
21. In antifluorite structure what percentage of the tetrahedral voids is occupied by cations?
0%
50%
100%
25%.
22. Number of mirror planes in a cube is
4
6
9
5
23. Ionic solids with Schottky defects contain in their structures
equal number of cation and anion vacancies
interstitial anions and anion vacancies
cation vacancies only
cation vacancies and interstitial cations.
24. A metal M has FCC arrangement and edge length of the unit cell is 400 pm. The atomic radius of M is
100 pm
200 pm
141 pm
173 pm.
25. How many four fold axes and three fold axes are there in a cube respectively?
1 1
2 3
3 3
4 3.
26. A pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at a higher temperature the turbidity completely disappears. The behaviour is a characteristic of substance forming
allotropic crystal
liquid crystal
isomeric crystal
isomorphous crystal.
27. Pure silicon doped with phosphorus is
amorphous
p-type conductor
n-type conductor
insulator.
28. Which of the following unit cells has the highest symmetry?
Hexagonal
Orthorhombic
Cubic
Monoclinic.
29. Which of the following pairs of species are likely to show Schottky type defects?
NaCl ZnS
CsCl NaCl
ZnS AgBr
AgBr NaCl.
30. In antifluorite structure the percentage of octahedral voids occupied is
100%
0%
50%
25%.
31. An atom at the edge centre of the cubic unit cell contributes??? to the particular unit cell.
2-Jan
1
8-Jan
1/4.
32. For a cubic void the radius ratio is equal to
0.225
0.414
0.732
0.155.
33. In zinc blende structure the distance of closest approach between two anions is equal to
half the edge length
half the face diagonal
3/4 th of body diagonal
body diagonal.
34. Which of the following of species are likely to exhibit Frenkel type defect?
NaBr Ad Br
ZnS CsCl
AgBrZnS
CsCl NaCl.
35. An element A crystallizes by adoption AB AB AB??? pattern of close packing the number of atoms in the unit cell is
6
3
4
8
36. In CsCl structure the number of anions per unit cell is
One
Two
Three
Four.
37. Which of the following is an anti-ferroelectric solid?
Barium titanate
Sodium potassium tartrate
Potassium hydrogen
Lead zirconate.
38. In zinc blende structure the number of formula units present in the unit cell is
4
6
1
8
39. Potassium crystallizes with
fcc lattice
bcc lattice
simple cubic lattice
orthorhombic lattice.
40. The ratio of close packed atoms to tetrahedral holes in cubic close packing
1:01
1:03
1:02
2:01
41. Crystals can be classified into??? basic crystal habits.
7
14
3
2
42. The number of NaCl units in a unit cell of its crystal
2
4
6
8
43. fcc arrangement of atoms contains number of atoms in each unit cell equal to
4
6
3
8
44. Clay is an example of
Orthosilicate
Sheet silicate
Chain silicate
Frame work silicate.
45. What is true about solids? I. Interparticle distance is minimumII. K.E. of particles is highIII. Interparticle attraction is largeIV. All solids have sharp mp and bp.
I II III
Only II
I III
IV II.
46. What is not true about amorphous solids? I. They undergo clean cleavage II. They do not have sharp melting pointsIII. They have high degree of rigidityIV. They exhibit isotropy. I
II III
I
V
IV.
47. If a is edge length of a face centred cubic unit cell then the distance of closest approach of two particles is
0.866a
1.732a
1.414a
0.707a.
48. The number of octahedral voids in HCP arrangement of N spheres is
2 N
N
3 N
4 N.
49. In a metal M having BCC arrangement edge length of the unit cell is 400 pm. The atomic radius of M is
100 pm
141 pm
173 pm
200 pm.
50. The tetrahedral holes occupied in diamond are
50%
25%
75%
100%.
51. The Edge length of face centred cubic unit cell is 508 pm. If the radius of cation is 110 pm the radius of anion is
110 pm
144 pm
618 pm
398 pm.
52. The intermetallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have co-ordination number of 8. The crystal class is
simple cube
body centred cube
face centred cube
end centred cube.
53. Which of the following describes hexagonal closed packed arrangement of spheres?
ABC ABA..............
ABC ABC...........
ABA BA...........
ABB ABB........
54. In which of the following arrangements a metal would have least density?
BCC
CCP
HCP
In all the three arrangements the density would be same.
55. In a body centred cubic unit cell of a metallic substance the number of atoms per unit cell is
4
1
2
3
56. The number of kinds of space lattices that are possible in a crystal is
23
7
230
14
57. Body diagonal of a cube is 866 pm. Its edge length would be
408 pm
1000 pm
500 pm
600 pm.
58. In rock salt structure coordination numbers of cation and anion are respectively.
4 6
6 6
8 6
12 6
59. Certain intermetallic compound of lithium and silver crystallizes in cubic structure in which both Li and Ag atoms have co-ordination number of 8. To what crystal class does the unit cell belong?
Primitive cubic
bcc
fcc
End centred.
60. In a cubic crystal anions are arranged in FCC and the cations occupy half the tetrahedral voids and all the octahedral voids. The ratio of cations and anions in the crystal is
1:01
2:01
1:02
3:02
61. In hexagonal close packing of spheres in three dimensions the co-ordination number of each spheres is
6
3
12
9
62. Edge length of a cubic unit cell is 400 pm. Its face diagonal would be
600 pm
200 pm
566 pm
692 pm.
63. Which of the following compound is an example of molecular solid?
Diamond
Dry ice
Sodium chloride
Zinc sulphide.
64. In zinc blende structure coordination number of cation is
4
6
8
12
65. For and atomic crystal having body centred cubic unit cells the number of atoms per unit cell is
4
8
9
2
66. In a close packing the radius of the octahedral void relative to the radius of the spheres constitution it is
0.732
0.225
0.414
0.155.
67. In zinc blende structure coordination number of cation is
6
4
8
12
68. The existence of a substance in more than one solid modification is known as
isomorphism
polymorphism
amorphism
allotropy.
69. When a cation and an anion are missing leaving behind a pair of voids the defect is known as:
F-centre
Schottky defect
Frenkel defect
None of these.
70. Edge length of a cube is 300 pm. Its body diagonal would be
600 pm
423 pm
519 pm
None of these.
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