Chemistry Class 12 Chapter 1 term 1 Objective Type Questions MCQS Solid State Solution

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

(a) High temperature     

(b) Low temperature    

(c) High thermal energy       

(d) Weak cohesive forces

Ans: (b) Low temperature 

 2. Which of the following is not a characteristic of a crystalline solid?

(a) Definite and characteristic heat of fusion.                   

(b) Isotropic nature.

(c) A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal. 

(d) A true solid

Ans: (b) Isotropic nature.                                                                                                                

3. Which of the following is an amorphous solid?

(a) Graphite (C)          

(b) Quartz glass (SiO2)           

(c) Chrome alum            

(d) Silicon carbide (SiC  )

Ans: (b) Quartz glass (SiO2)

 4. Which of the following is true about the value of refractive index of quartz glass?

(a) Same in all directions

(b) Different in different directions

(c) Cannot be measured

(d) Always zero

Ans: (a) Same in all directions

5. Which of the following statement is not true about amorphous solids?

(a) On heating they may become crystalline at certain temperature.

 (b) They may become crystalline on keeping for long time.

(c) Amorphous solids can be moulded by heating.

(d) They are anisotropic in nature.

Ans: (d) They are anisotropic in nature

6. The sharp melting point of crystalline solids is due to ................ .

(a) a regular arrangement of constituent particles observed over a short distance in the crystal lattice 

(b) a regular arrangement of constituent particles observed over a long distance in the crystal lattice. 

(c) same arrangement of constituent particles in different directions.                                                      

(d) different arrangement of constituent particles in different directions.

Ans:  (b) a regular arrangement of constituent particles observed over a long distance in the crystal lattice. 

7. Iodine molecules are held in the crystals lattice by ................. .    

(a) London forces         

(b) dipole-dipole interactions         

(c) covalent bonds        

(d) coulombic forces

Ans: (a) London forces 

 8. Which of the following is a network solid?

 (a) SO2 (Solid)                             

(b) I2                                  

(c) Diamond                                     

(d) H2O (Ice)

Ans: (c) Diamond

9. Which of the following solids is not an electrical conductor?

 I. Mg (s)              II. TiO (s)                     III. I2 (s)                     IV. H2O (s)

(a) (A) only               (b) (B) Only                     (c) (C) and (D)                      (d) (B), (C) and (D)

Ans:

10. Which of the following is not the characteristic of ionic solids?

 (a) Very low value of electrical conductivity in the molten state.                     

(b) Brittle nature.                                 

(c) Very strong forces of interactions.                                                                     

(d) Anisotropic nature.

Ans:

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

 (i) High temperature          (ii) Low temperature         (iii) High thermal energy            (iv) Weak cohesive forces

 Ans:

12. Which of the following is not the characteristic of ionic solids?

(i) Very low value of electrical conductivity in the molten state.                             (ii) Brittle nature.

(iii) Very strong forces of interactions.                                                                     (iv) Anisotropic nature.

 Ans:

13. Graphite is a good conductor of electricity due to the presence of __________.

 (i) lone pair of eletron               (ii) free valence electrons                      (iii) cations                               (iv) anions

 Ans:

14. Which of the following oxides behaves as conductor or insulator depending  upon temperature?

 (i) TiO                           (ii) SiO2                              (iii) TiO3                               (iv) MgO

 Ans:

15. Which of the following oxides shows electrical properties like metals?

 (i) SiO2                        (ii) MgO                               (iii) SO2(s)                            (iv) CrO2

 Ans:

16. The lattice site in a pure crystal cannot be occupied by _________.

 (i) molecule                 (ii) ion                                 (iii) electron                             (iv) atom

Ans: 

17. Graphite cannot be classified as __________.

 (i) conducting solid            (ii) network solid               (iii) covalent solid                 (iv) ionic solid

 Ans:

18. Cations are present in the interstitial sites in __________.

 (i) Frenkel defect            (ii) Schottky defect               (iii) Vacancy defect            (iv) Metal deficiency defect

 Ans:

19. Which of the following is true about the charge acquired by p-type semiconductors?

 (i) positive               (ii) neutral                             (iii) negative               (iv) depends on concentration of p impurity

 Ans:

20. To get a n-type semiconductor from silicon, it should be doped with a substance with valence__________.

 (i) 2                               (ii) 1                           (iii) 3                             (iv) 5

 Ans: (iv) 5

21. The total number of tetrahedral voids in the face centred unit cell is __________.

 (i) 6                            (ii) 8                                 (iii) 10                       (iv) 12

 

22. Which of the following point defects are shown by AgBr(s) crystals?

 (A) Schottky defect          (B) Frenkel defect          (C) Metal excess defect                (D) Metal deficiency defect

 (i) (A) and (B)

(ii) (C) and (D)

(iii) (A) and (C)

(iv) (B) and (D)

 

23. In which pair most efficient packing is present?

 (i) hcp and bcc              (ii) hcp and ccp                 (iii) bcc and ccp                    (iv) bcc and simple cubic cell

 

24. The percentage of empty space in a body centred cubic arrangement is

(i) 74

(ii) 68

(iii) 32

(iv) 26

 

25. Which of the following statement is not true about the hexagonal close packing?

 (i) The coordination number is 12.

(ii) It has 74% packing efficiency.

(iii) Tetrahedral voids of the second layer are covered by the spheres of the third layer.

(iv) In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer.

 

26. In which of the following structures coordination number for cations and anions in the packed structure will be same?

 (i) Cl– ion form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell.

(ii) Ca2+ ions form fcc lattice and F – ions occupy all the eight tetrahedral voids of the unit cell.

(iii) O2– ions form fcc lattice and Na+ ions occupy all the eight tetrahedral voids of the unit cell.

(iv) S2– ions form fcc lattice and Zn2+ ions go into alternate tetrahedral voids of the unit cell.

 

27. What is the coordination number in a square close packed structure in two dimensions?

 (i) 2                         (ii) 3                        (iii) 4                   (iv) 6

 

28. Which kind of defects are introduced by doping?

 (i) Dislocation defect               (ii) Schottky defect                (iii) Frenkel defects               (iv) Electronic defects

 

29. Which of the following is not true about the ionic solids?

 (i) Bigger ions form the close packed structure.

(ii) Smaller ions occupy either the tetrahedral or the octahedral voids depending upon their size.

(iii) Occupation of all the voids is not necessary.

(iv) The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids

 

30. The correct order of the packing efficiency in different types of unit cells is ________.

 (i) fcc < bcc < simple cubic                                     (ii) fcc > bcc > simple cubic

(iii) fcc < bcc > simple cubic                                  (iv) bcc < fcc > simple cubic

 

31. Which of the following defects is also known as dislocation defect?

 (i) Frenkel defect                                                           (ii) Schottky defect         

(iii) Non-stoichiometric defect                                     (iv) Simple interstitial defect

 

32. In the cubic close packing, the unit cell has ________.

 (i) 4 tetrahedral voids each of which is shared by four adjacent unit cells.

(ii) 4 tetrahedral voids within the unit cell.

(iii) 8 tetrahedral voids each of the which is shared by four adjacent unit cells.

(iv) 8 tetrahedral voids within the unit cells.

 

33. Which of the following transition metal oxides is paramagnetic?

(a) TiO                (b) VO                   (c) Cu2O                        (d) Mn2O3

 

34. Which of the following transition metal oxides is not an insulator?

(a) MnO2                         (b) Ni O                            (c) VO                                (d) Mn2O3

 

35. Coordination number in ccp and hep arrangements of metal atoms are respectively.

(a) 6, 6               (b) 12, 6                 (c) 8, 6                   (d) 12, 12

36. An example of body centered cube is

(a) Sodium                (b) Magnesium                     (c) Zinc                  (d) Copper

37. Which of the following is not an example of 13-15 compounds,

(a) InSb                     (b) GaAs                     (c) CdSe                           (d) Alp

 

38. For tetrahedral coordination, the radius ration (r+/r ) should be

(a) 0.155-0.225             (b) 0.225-0.414                (c) 0.414-0.732                     (d) 0.732-1

 

39. A compound formed by elements A and B crystallises in the cubic structure where A atoms are at comers of a cube and B atoms are at face centres. The formula of the compound is

(a) AB3                                (b) A2B                                     (c) AB2                                      (d) A2B3

 

40. How many space lattices are possible in a crystal?

(a) 23                         (b) 7                          (c) 230                             (d) 14

 

41. The number of atoms in bcc arrangement is

(a) 1                      (b) 2                        (c) 4                                (d) 6

 

42. In face-centered cubic unit cell, edge length is

(a) 4√3r                             (b) 4√2r                             (c) 2r                                   (d) √32r

 

43. Metallic lustre is explained by

(a) diffusion of metal ions    (b) oscillation of loose electrons    (c) excitation of free protons     (d) existence of bcc lattice.

 

44. In a face-centered cubic lattice, unit cell is shared equally by how many unit cells?

(a) 4                           (b) 2                                (c) 6                                   (d) 8

 

45. The percentage of iron present as Fe (III) in Fe0.93 O1.0 is

(a) 17.7%                            (b) 7.84%                              (c) 11.5%                              (d) 9.6%

 

46. Which of the following fee structure contains cations in alternate tetrahedral voids? (IIT 2005)

(a) NaCl                         (b) ZnS                             (c) Na2O                               (d) CaF2

 

47. The numbers of tetrahedral voids in the unit cell of a face centered cubic lattice of similar atoms is

(a) 4                             (b) 6                       (c) 8                      (d) 10                             (e) 12

 

48. The hardest substance among the following is

(a) Be2C                     (b) Graphite                        (c) Titanium                       (d) SiC                    (e) B4C

 

49. How many unit cells are present in a cube-shaped ideal crystal of NaCl of mass 1.00 g? (Atomic mass of Na = 213, Cl = 35.5)

(a) 5.14 × 1021                        (b) 1.28 × 1021                         (c) 1.71 × 1021                        (d) 2.57 × 1021

 

50. What is the coordination number of Cl- in NaCl crystals

(a) 8                        (b) 6                             (c) 4                              (d) 3

 

51. 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) 15.96 × 10-2                          (c) 5.96 × 10-1                     (d) 5.96 × 10-3

 

52. If Z is the number of atoms in the unit cell that represents the closest packing sequence….ABC ABC….the number of tetrahedral voids in the unit cell is equal to

(a) Z                         (b) 2Z                       (c) Z/2                                  (d) Z/4

 

53. Which has no rotation of symmetry?

(a) Hexagonal                (b) Orthorhombic                      (c) Cubic                         (d) Triclinic

 

54. If the distance between Na+ and Cl– ions in sodium chloride crystal is X pm the length of the edge of the unit cell is

(a) 4X pm                  (b) X/4 pm                          (c) X/2 pm                          (d) 2 × pm

55. Which of the following metal oxides is antiferromagnetic in nature?

(a) MnO2                       (b) TiO2                                (c) VO2                              (d) CrO2

56. The interionic distance for cesium chloride crystal will be

(a) a                            (b) a/2                      (c) √3 a/2                             (d) 2a/√3

57. The liquified metal expanding on solidification is

(a) Ga                              (b) Al                                 (c) Zn                          (d) Cu

58. The number of unit cells in 58.5 g of Na Cl is nearly

(a) 6 × 1020                     (b) 3 × 1022             (c) 1.5 × 1023                    (d) 0.5 × 1024

59. The number of octahedral sites per sphere in fee structure is

(a) 8               (b) 4                    (c) 2                          (d) 1                                                                                                                                                                          

60. The crystal system of a compound with unit cell dimensions a = 0.387, b = 0.387 and c – 0.504 nm and α = ß = 90° and γ = 120° is

(a) Cubic             (b) Hexagonal                        (c) Orthorhombic                  (d) rhombohedral

61. Which type of crystal defect is indicated in the diagram below?



(a) Frenkel defect             (b) Schottky defect             (c) Interstitial defect                (d) Frenkel and Schottky defect

 Ans:(b) Schottky defect

 

 

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