The Solid State – Objectives
1. Which of the following conditions favors the existence of a substance in a solid-state?
(a) High temperature
(b) Low temperature
(c) High thermal energy
(d) Weak cohesive force
Answer:- (b) Low temperature
2. Which of the following is not the characteristics of crystalline solid?
(a) Definite and characteristics of the heat of fusion.
(b) Isotropic nature
(c) A regular periodically repeated the pattern of arrangements of constituent particles in the entire crystal.
(d) A true solid
Answer:- (b) Isotropic nature
3. Which of the following is not the characteristic of ionic solid?
(a) A very low value of electrical conductivity in the molten state
(b) Brittle nature
(c) very strong forces of attraction
(d) Anisotropic in nature
Answer:- (a) Very low value of electrical conductivity in the molten state
4. Which of the following exists as covalent crystals in the solid-state?
(a) Sulfur
(b) Phosphorus
(c) Iodine
(d) Silicon
Answer:- (d) Silicon
5. In a closed packed array of N-spheres, the number of octahedral holes is
(a) N/2
(b) 2N
(c) N
(d) 4N
Answer:- (c) N
6. Percentage of free space in bcc. Unit cell is-[2018]
(a) 32%
(b) 34%
(c) 28%
(d) 30%
Answer:- (a) 32%
7. The coordination number of a metal crystallizing in hexagonal close-packed (hcp) structure is-[2018]
(a) 12
(b) 8
(c) 4
(d) 6
Answer:- (a) 12
8. In which of the following pairs of structures are tetrahedral as well as octahedral voids respectively?[2018]
(a) bcc and fcc
(b) hcp and simple cubic
(c) hcp and ccp
(d) bcc and hcp
Answer:- (c) hcp and ccp
9. Potassium crystallizes in bcc lattice. Hence the coordination number of the element in the crystal structure is-
(a) 0
(b) 4
(c) 6
(d) 8
Answer:- (d) 8
10. Which has an hcp crystal structure?
(a) NaCl
(b) CsCl
(c) Zn
(d) RbCl
Answer:- (c) Zn
11. In a solid lattice, the cation has left a lattice site and is located in an interstitial position. The lattice defect is-
(a) Interstitial defect
(b) Vacancy defect
(c) Frenkel defect
(d) Schottky defect
Answer:- (c) Frenkel defect
12. Potassium crystallizes with a-
(a) face-centered cubic lattice
(b) body-centered cubic lattice
(c) simple cubic lattice
(d) orthorhombic lattice
Answer:- (b) body-centered cubic lattice
13. The total number of lattice arrangements in different types of crystals are:
(a) 7
(b) 3
(c) 10
(d) 14
Answer:- (d) 14
14. Avogadro’s number (N) is equal to-
(a) 6.022 x 1024
(b) 6.022 x 1023
(c) 6.022 x 10-23
(d) 11.2
Answer:- (b) 6.022 x 1023
15. The edge length of a face-centered unit cubic cell is 508pm. If the radius of a cation is 110pm, the radius of anion will be-
(a) 288 pm
(b) 144 pm
(c) 618 pm
(d) 398 pm
Answer:- (b) 144 pm
16. The appearance of color in solid alkali metal halides is generally due to:
(a) interstitial positions
(b) F-centres
(c) Schottky defect
(d) Frenkel defect
Answer:- (b) F-centres
17. Percentage of free space in the body-centered cubic unit cell is:
(a) 34%
(b) 28%
(c) 30%
(d) 32%
Answer:- (d) 32%
18. What is the ratio of the radius of sphere and radius of void in tetrahedral voids-
(a) 0.115R
(b) 0.225R
(c) 0.335R
(d) 0.445R
Answer:- (b) 0.225R
19. The intermediate compound LiAg crystallizes in a cubic lattice in which both silver and lithium have co-ordination number is eight. The nature of crystal is
(a) Simple cubic
(b) Body-centered cubic
(c) Face centered cubic
(d) None of these
Answer:- (b) Body-centered cubic
20. What is the co-ordination number of sodium in sodium oxide (Na2O)
(a) 6
(b) 4
(c) 8
(d) 2
Answer:- (c) 8
21. In a face-centered cubic lattice, a unit cell is equally shared by how many faces?
(a) 2
(b) 4
(c) 6
(d) 8
Answer:- (c) 6
22. A compound formed by the elements X and Y crystallizes in a cubic structure in which the X atoms are at the corners of the cube and Y atoms at the face centers. The formula of the compound is:
(a) XY3
(b) X3Y
(c) XY
(d) XY2
Answer:- (a) XY3
23. A binary solid (AB) has a rock salt structure. If the edge length is 400 pm and the radius of a cation is 75 pm, then the radius of anion will be-
(a) 100 pm
(b) 125 pm
(c) 250 pm
(d) 325 pm
Answer:- (b) 125 pm
24. Al (atomic mass = 27) crystallizes in a cubic system with an edge length equal to 4Å. Its density is 2.7g/cm3. The type of the unit cell is-
(a) Simple
(b) Face centered
(c) Body-centered
(d) None of these
Answer:- (b) Face centered
25. An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centers of the faces of the cube. The empirical formula of the compound would be-
(a) AB
(b) A2B
(c) AB3
(d) A3B
Answer:- (c) AB3
26. For a covalent solid, the particles which occupy the lattice points are:
(a) atoms
(b) ions
(c) molecules
(d) electrons
Answer:- (a) atoms
27. How many kinds of Space lattices are possible in a crystal.
(a) 23
(b) 7
(c) 230
(d) 14
Answer:- (d) 14
28. Which has a Frenkel defect?
(a) Sodium chloride
(b) Graphite
(c) Silver bromide
(d) Diamond
Answer:- (c) Silver bromide
29. Which of the following is a network solid?
(a) Solid SO2
(b) I2
(c) Diamond
(d) H2O (ice)
Answer:- (c) Diamond
30. Cations are present in interstitial sites in-
(a) Frenkel defect
(b) Schottky defect
(c) Vacancy defect
(d) Metal deficiency defect
Answer:- (a) Frenkel defect
31. To get an n-type semiconductor from Silicon, it should be doped with a substance with valency.
(a) 2
(b) 1
(c) 3
(d) 5
Answer:- (d) 5
32. Number of tetrahedral void in FCC unit cell is
(a) 6
(b) 8
(c) 10
(d) 12
Answer:- (b) 8
33. The correct order of packing Fraction indifferent types of unit cells are-
(a) fcc < bcc < simple cubic
(b) fcc > bcc > simple cubic
(c) fcc < bcc > simple cubic
(d) bcc < fcc > simple cubic
Answer:- (b) fcc > bcc > simple cubic
34. Which kinds of defects are introduced by doping?
(a) Dislocation defect
(b) Schottky defect
(c) Frenkel defect
(d) Electronic defect
Answer:- (d) Electronic defect
35. Which of the following is true about the charge acquired by the p-type semiconductor
(a) Positive
(b) neutral
(c) negative
(d) depends on conc. of p-impurity
Answer:- (b) neutral
36. The lattice site in a pure crystal cannot be occupied by-
(a) molecule
(b) ion
(c) electron
(d) atom
Answer:- (c) electron
37. Graphite is a good conductor of electricity due to the presence of-
(a) lone pair of electrons
(b) free valence electrons
(c) covalent bonds
(d) coulombic forces
Answer:- (b) free valence electrons
38. Iodine molecules are held in the crystals lattice by-
(a) London Force
(b) Dipole-Dipole interaction
(c) covalent bonds
(d) coulombic forces
Answer:- (a) London Force
39. Which of the following oxides show electrical properties like metals?
(a) SiO2
(b) MgO
(c) SO2
(d) CrO2
Answer:- (d) CrO2
40. Which of the following is an amorphous solid?
(a) Graphite
(b) Quartz Glass
(c) Chromium
(d) Silicon Carbide
Answer:- (b) Quartz Glass
41. In Rock salt type structure how many co-ordination numbers of each ion.
(a) 1
(b) 3
(c) 5
(d) 6
Answer:- (d) 6
42. Which of the point defect changes the density of corresponding solid in a crystal unit cell.
(a) Schottky defect
(b) Frenkel defect
(c) Metal excess defect
(d) Metal less defect
Answer:- (a) Schottky defect
43. What is the radius ratio of octahedral void.
(a) 0.212
(b) 0.314
(c) 0.414
(d) 0.205
Answer:- (c) 0.414
44. When electrons are trapped in the crystal in the anionic vacancy, the defect is known as-
(a) Schottky defect
(b) Frenkel defect
(c) Stoichiometric defect
(d) F-centres
Answer:- (d) F-centres
45. The number of tetrahedral voids for atoms in a crystal lattice are-
(a) 1
(b) 2
(c) 4
(d) 8
Answer:- (b) 2
Also Read:- English 100 Marks Bihar Board Class 12th
46. In the crystal structures of sodium chloride, the arrangement of Cl– ions are-
(a) fcc
(b) bcc
(c) Both fcc and bcc
(d) None of these
Answer:- (a) fcc
47. Na and Mg crystallize in bcc and fcc type crystals respectively. The number of atoms in the unit cells of their respective crystals is-
(a) 4 and 2
(b) 9 and 14
(c) 14 and 9
(d) 2 and 4
Answer:- (d) 2 and 4
48. If we mix a pentavalent impurity in the crystal lattice of germanium, the type of semiconductor formed will be:
(a) p-type
(b) n-type
(c) both (a) and (b)
(d) None of these
Answer:- (b) n-type
49. In the crystals of which of the following ionic compounds, the distance between centers of the cations and anions is the maximum?
(a) LiF
(b) CsF
(c) CsI
(d) LiI
Answer:- (c) CsI
50. Co-ordination number of sodium ion Na+ in NaCl is
(a) four
(b) three
(c) six
(d) five
Answer:- (c) six
51. The number of unit cells in 58.5g of NaCl is near:
(a) 6 x 1020
(b) 3 x 1022
(d) 0.5 x 1024
Answer:- (c) 1.5 x 1023
52. Which one of the following is non-crystalline or amorphous?
(a) Diamond
(b) Graphite
(c) Glass
(d) Common Salt
Answer:- (b) Graphite
53. Which of the following is true about the value of the refractive index of quartz glass?
(a) Same in all direction
(b) Different in a different direction
(c) Cannot be measured
(d) Always zero
Answer:- (a) Same in all direction