Solid State Chemistry Class 12 Full Chapter Important Questions & Answers with pdf

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Table of Contents

SOLID STATE

  1. Number of particles per unit cell of BCC lattice is
    (b) 2
    (a) 1
    (d) 8
    (c) 4
  2. Co-ordination number of FCC crystal is
    (b) 4
    (a) 12
    (d) 8
    (c) 6
  3. Co-ordination number of HCP crystal is
    (b) 6
    (a) 4
    (d) 12
    (c)8
  4. Empty space in BCC lattice is
    (b) 32%
    (a) 26%
    (d) 68%
    (c) 48%
  5. Packing efficiency in simple cubic crystal is
    (b)√2/6
    (a)π/6
    (d)π√3/16
    (c)π√3/8
  6. Packing efficiency in diamond is
    (a) 74
    (b) 68
    (d) 52
    (c) 48
  7. Packing efficiency in CCP lattice is
    (a) 34%
    (b) 52%
    (c) 68%
    (d) 74%
  8. Packing efficiency in CsCl type lattice is
    (b) 68%
    (a) 74%
    (d) None
    (c) 52%
  9. In cubic arrangement of ‘N’ spheres number of tetrahedral and number of octahedral voids are respectively
    (b) N, 2N
    (a) N, N
    (d) 2N,N
    (C) 2N, 2N
  10. Co-ordination number of BCC crystal is
    (b) 4
    (a) 2
    (d) 12
    (c) 8
  11. Number of unit cells in 168.5 g of CSCI crystal is nearly
    (b) 3×1023
    (a) 6.02×10
    (d) None of these
    (c) 1.5×103
  12. In FCC an atom on the face is equally shared by how many unit cells?
    (b) 4
    (a) 2
    (d) 8
    (c) 6
  13. Number of particles per unit cell of FCC crystal is
    (b) 4
    (a) 2
    (d) 12
    (c) 8
  14. In which of the following crystals alternate tetrahedral voids are occupied?
    (a) NaC
    (b) ZnS
    (c) CsCI
    (d) CaF
  15. The appearance of colour in solid alkali metal halides is generally due to –
    (a) Frenkel defect
    (b) Schottky defect
    (c) F-Centres
    (d) Interstitial defect
  16. Relation between radius of spherical particle (r) and distance of nearest neighbours in a simple cubic crystal is
    (b)r=√2d
    (a)r=d/2
    (C)r=(√3/2)d
    (d) None of these
  17. Relation between radius of spherical particle (r) and edge length in FCC crystal is
    (b) a =2r
    (a) a= 2√2r
    (c) a=( 4/√3)r
    (d) a
  18. Relation between edge length (a) and distance between nearest neighbours (d) in a BCC crystal is
    (b) a √2d
    (a) a = d
    (c) a=(2/√3)d
    (d) None of these
  19. The radius ratio of an octahedral crystal will be
    (b) 0.732-0.414
    (a) 1-0.732
    (d) 0.225-0.155
    (c) 0.414-0.225
  20. The range of radius ratio of tetrahedral crystals will
    be

    (b) 0.732-0.414
    (a) 1-0.732
    (d) 0.225 0.155
    (c) 0.414-0.225
  21. Total volume of atoms present in BCC unit cell of a
    metal is

    (b)8/3πr³
    (a)4/3πr³
    (c)16/3πr³
    (d) 24/3πr³
  22. Total volume of atoms present in FCC unit cell of a
    metal is

    (b) 2×4/3πr³
    (a)4/3πr³
    (d) 6×4/3πr³
    (c) 4×4/3πr³
  23. Total volume of atoms present in HCP unit cell of a
    metal is
    (b) 24/3 πr³
    (a)16/3πr³
    (c) 12/3πr³
    (d) 8/3πr³
  24. Number of particles per unit cell of a
    simple cubic crystal is

    (b) 4
    (a) 6
    (d) 1
    (c) 2
  25. Number of unit cells in 58.5 g NaCl crystal is nearly
    (6) 3.011×10
    (a) 6.023 x 1023
    (d) 4.5×10
    (c) 1.5×1023
  26. In CsCl crystal arrangement the lattice points are occupied by
    (b) CI ions
    (a) Cs ions
    (C) both Cs and Cs 1ons (d) None of these
  27. In NaCl crystal arrangement, the interstitial sites are occupied by
    (b) Cl ions
    (a) Na ions
    (c) both Na and Ci 1ons
    (d) Can’t be predicted
  28. In CaF, the lattice sites are occupied by
    (b) F ions
    (a) Ca ² ions
    (d) None of these
    (c) both the ions
  29. In ZnS arrangement Zn2 1ons occupy the…..Void
    (b) tetrahedral
    (a) octahedral
    (d) can’t be said
    (c) both
  30. In CaF, crystal the Fions occupy the
    (b) octrahedral
    (a) tetrahedral
    (d) can’t be said
    (c) both
  31. In cubic arrangement the lattice points are occupied
    by

    (6) small atoms
    (a) big atoms
    (d) none of these
    (c) both
  32. In cubic arrangement the voids are occupied by
    (b) small atoms
    (a) big atoms
    (c) both
    (d) none of these
  33. In crystal lattice the lattice positions are generally
    occupied by

    (b) anions
    (a) cations
    (c) both the ions
    (d) none of these
  34. Crystalline solids are generally
    (a) isotropic
    (6) anisotropic
    (c) both of these
    (d) volatile
  35. Property of amorphous solid is
    (a) isotropic
    (b) anisotropic
    (c) both of these
    (d) can’t be said
  36. In a crystal lattice the interstitial positions are
    generally Occupied by
    (b) anions
    (a) cations
    (d) None
    (c) both
  37. Co-ordination pattern in CaF, crystal is
    (b) 8:8
    (a) 4:4
    (d) 4:8
    (c) 8:4

38, Co-ordination pattern in ZnS crystal is
(b) 4:4
(a) 6:6
(d) None
(c) 8:8

  1. Co-ordination number of Ci in CsCl crystal is
    (b) 6
    (a) 4
    (d) 12
    (c)8
  2. Co-ordination number of Na in NaCl crystal is-
    (b) 8
    (a) 4
    (d) 6
    (c) 12
  3. Number of formula units per unit cell of NaCl crystal is four. If the edge length of the unit cell is 0.564nm, the density of NaCl crystal is
    (b) 2.16 g/cm³
    (a) 1.2 g/cm³
    (d) 4.56 g/cm³
    (c) 3.64g/cm³
  4. In a cubic arrangement ‘X atoms occupy the corners and Y atoms occupy the face centres. The formula of the compound is
    (b) XY³
    (a) XY
    (d) X³Y
    (c)XY³
  5. In FCC arrangement ‘A’ atoms occupy the corners and B atom is missing from one of the face centred
    points. Then formula of the compound is

    (b) A²B
    (a) AB²
    (c) A²B³
    (d) A²B⁵
  6. In a crystal arrangement X atoms are placed at the corners and Y atoms are placed at the body centres. Then formula of the compound is
    (b) XY³
    (a) XY
    (c) X³Y
    (d) XY²
  7. in a crystal arrangement ‘A’ atoms are placed at
    corners and B’ atoms are placed at alternative faces
    of the cube. Formula of the compound is

    (a) A²B
    (b) AB²
    (c) AB
    (d) AB³
  8. In a cubic arrangement the X’ atoms are placed at Corners and body centres. Y atoms are placed at edge centres. The formula of the compound is
    (a) X³Y²
    (b) X²Y³
    (c)X²Y⁵
    (d) X⁵Y²
  9. The edge length of a FCC cell of an ionic substance is 508 pm. If the radius of cation is 110 pm, the radius of anion is
    (b) 288 pm
    (a) 249 pm
    (d) None
    (c) 398 pm
  10. Empty space in hcp unit cell is
    (b) 47.6%
    (a) 74%
    (d) 26%6
    (c) 32%
  11. Number of octahedral sites for each sphere in a close
    packed crystal is-

    (b) 2
    (a) 1
    (d) 4
    (c) 3
  12. Interionic distance for CsCl crystal will be
    (a) 2a/√3
    (b) a/2
    (c)√3/2a
    (d) None
  13. Number of tetrahedral sites for each sphere in a close packed crystal is –
    (b) 2
    (a)1
    (d) 4
    (c) 3
  14. What is the structure of NaCl?
    (b) hcp
    (a) bcc
    (d) none
    (c)fcc
  15. Number of unit in 4g of an element, (atomic mass 40) which crystalises bec pattern is
    (a) N⁰/10
    (b) N⁰/29
    (c) 2N⁰
    (d)N⁰
  16. Co-ordination number of rock salt type structure is
    (b) 6
    (a) 1
    (d) 2
    (c) 8
  17. Bragg’s equation is
    (b) nΠ=2n sin ∅
    (a) n= 2d sin ∅
    (d) ni=sin∅
    (c) 2d sin ∅
  18. In a solid lattice the cation has left a lattice site and is located at an interstitial position. The lattice defect
    is known as

    (a) Interstitial defect
    (b) Frenkel defect
    (c) Schottky defect
    (d) Cation defect
  19. Schottky defect defines imperfection in the lattice
    structure of
    (a) solid
    (b) liquid
    (c) gas
    (d) all of these
  20. All the solid crystals can be classified into
    (a) 7 crystal systems
    (b) 14 crystal systems
    (c) 32 crystal systems
    (d) 9 crystal systems
  21. Silica is an example of-
    (a) covalent crystal
    (b) ionic crystal
    (d) molecular crystal
    (c) metallic crystal
  22. Which of the following is an example of covalent
    solid ?

    (b) diamond
    (a) rock salt
    (d) copper
    (c) iodine
  23. Crystals which are good conductor of heat and
    electricity are
    (b) covalent
    (a) ionic
    (d) metallic
    (c) molecular
  24. Ionic solids are characterised
    (a) low melting point
    (b) extremely volatile
    (c) good conductor of electricity in solid state
    (d) soluble in polar solvent
  25. Which of the following is amorphous?
    (b) rubber
    (a) glass
    (d) all
    (c) bakelite
  26. In a simple cubic crystal each atom on a corner iS
    shared by

    (a) 4 unit cells
    (b)8 unit cells
    (c) 6 unit cells
    (d) 1 unit cell
  27. Close packing is maximum in the crystal which is
    (b) bondy centred cubic
    (a) simple cubic
    (c) face centered cubic
    (d) can’t be predicted
  28. The 8:8 typeof packing is present in
    (b) NaCl1
    (a) CsC1
    (c) ZnS
    (d) KCI
  29. The co-ordination number in hep arrangement is
    (a) 6
    (b) 8
    (c) 10
    (d) 12
  30. Schottky defect is generally appears in
    (a) CsCI
    (b) NaCi
    (c) KCI
    (d) all of these
  31. n-type semiconductor can be obtained by adding
    to pure germanium

    (a) Ga
    (b) As
    (c) Si
    (d) B
  32. p-type semiconductor can be obtained by adding –
    to pure germanium.

    (a) Gr-13 element
    (b) Gr-14 element
    (c) Gr-15 element
    (d) None of these

ANSWERS

1.(b) 2. (a) 3. (d) 4. (b) 5. (a) 6. (a) 7. (d) 8. (b) 9.(d) 10. (c) 11. (a) 12. (a) 13. (b) 14. (b)) 15. (c) 16. (a) 17. (6) 18. (C) 19. (b) 20. (c) 21. (b) 22. (c) 23. (a) 24. (d) 25. (c) 26. (b) 27. (a) 28. (a) 29. (b) 30. (a) 31 (a) 32. (5) 33. (b) 34. (b) 35. (a) 36. (a) 37. (c) 38. (b) 39. (c) 40. (d) 41. (b) 42. (c) 43. (d) 44. (a) 45. (c) 46. (b) 47. (a) 48. (d) 49. (a) 50. (c) 51. (b) 52. (c) 53. (b) 54. (b) 55. (a) 56. (b) 57. (a) 58. (a) 59. (a) 60. (b) 61. (d) 62. (d) 63. (d) 64. (b) 65. (c) 66. (a) 67. (d) 68. (d) 69. (b) 70. (a)

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