Solid State Class 12 Chapter 1 MCQs For Your CBSE Board Exams, These Question Based on Your Exam Level That CBSE Should Asked in Your Class 12 Board Exam
Solid State MCQs
Question 1: Alkali halides do not show Frenkel defects because
(a) cations and anions have almost equal size
(b) there is a large difference in the size of cations and anions
(c) cations and anions have a low coordination number
(d) anions cannot be accommodated in voids
Answer: (a) cations and anions have almost equal size
Question 2: The coordination number of Y will be in the XY types of crystal:
(a) 6
(b) 8
(c) 12
(d) 4
Answer: (a) 6
Question 3: The fraction of the total volume occupied by the atoms present in a simple cube is
(a) π4
(b) π6
(c) π3√2
(d) π4√2
Answer: (b) π6
Question 4: The edge length of a unit cell of chromium metal is 287 pm with a bcc arrangement. The atomic radius is of the order
(a) 287 pm
(b) 574 pm
(c) 124.27 pm
(d) 143.5 pm
Answer: (c) 124.27 pm
Question 5: The edge length of the fee cell is 508 pm. If the radius of cation is 110 pm, the radius of the anion is
(a) 110 pm
(b) 220 pm
(c) 285 pm
(d) 144 pm
Answer: (d) 144 pm
Question 6: The coordination number of Y will be in the XY types of crystal:
(a) 6
(b) 8
(c) 12
(d) 4
Answer: (a) 6
Question 7: The fraction of the total volume occupied by the atoms present in a simple cube is
(a) π4
(b) π6
(c) π3√2
(d) π4√2
Answer: (b) π6
Question 8: Edge length of a unit cell of chromium metal is 287 pm with a bcc arrangement. The atomic radius is of the order
(a) 287 pm
(b) 574 pm
(c) 124.27 pm
(d) 143.5 pm
Answer: (c) 124.27 pm
Question 9: The density of a metal which crystallises in bcc lattice with unit cell edge length 300 pm and molar mass 50 g mol-1 will be
(a) 10 g cm-3
(b) 14.2 g cm-3
(c) 6.15 g cm-3
(d) 9.3 2 g cm-3
Answer: (c) 6.15 g cm-3
Question 10: How many lithium atoms are present in a unit cell with an edge length of 3.5 Å and density of 0.53 g cm-3? (Atomic mass of Li = 6.94):
(a) 2
(b) 1
(c) 4
(d) 6
Answer: (a) 2
Question 11: The distance between Na– and CL– ions in NaCl with a density of 2.165 g cm-3
(a) 564 pm
(b) 282 pm
(c) 234 pm
(d) 538 pm
Answer: (b) 282 pm
Question 12: An element with atomic mass 100 has a bcc structure and edge length of 400 pm. The density of elements is
(a) 10.37 g cm-3
(b) 5.19 g cm-3
(c) 7.29 g cm-3
(d) 2.14 g cm-3
Answer: (b) 5.19 g cm-3
Question 13: Close packing is maximum in the crystal which is
(a) bcc
(b) fee
(c) simple cubic
(d) end centred cubic
Answer: (b) fee
Question 14: In a solid lattice, the cation has left a lattice site and is located at an interstitial position. The lattice defect is
(a) n-type
(b) p-type
(c) Frenkel defect
(d) Schottky defect
Answer: (c) Frenkel defect
Question 15: The coordination number of metal crystallizing in a hexagonal close packing structure is
(a) 12
(b) 4
(c) 8
(d) 10
Answer: (a) 12
Question 16: In a body centred unit cell, the number of atoms present is
(a) 1
(b) 2
(c) 3
(d) 4
Answer: (b) 2
Question 17: In a trigonal crystal
(a) a = b = c, α = ß = γ ≠ 90°
(b) a = b ≠ c, α = ß = γ = 90°
(c) a ≠ b ≠ c, α = ß = γ = 90°
(d) a = b ≠ c, α = ß = 90°, γ = 120°
Answer: (a) a = b = c, α = ß = γ ≠ 90°
Question 18: The appearance of colour in solid alkali metal halides is generally due to
(a) Schottky defect
(b) Frenkel defect
(c) F-centre
(d) Interstitial position
Answer: (c) F-centre
Question 19: In a body-centred cubic structure, the space occupied is about
(a) 74%
(b) 20%
(c) 68%
(d) 52.4%
Answer: (c) 68%
Question 20: Polar crystals when heated produce a small electrical current. The phenomenon is called
(a) Ferroelectricity
(b) Anti-ferroelectricity
(c) Pyroelectricity
(d) Piezoelectricity
Answer: (c) Pyroelectricity
Question 21: The empty space within hep arrangement is
(a) 34%
(b) 47.6%
(c) 32%
(d) 26%
Answer: (d) 26%
Question 22: A crystal system with axes a ≠ b ≠ c and angles α ≠ ß ≠ γ ≠ 90° corresponds to
(a) monoclinic
(b) triclinic
(c) cubic
(d) tetragonal
Answer: (b) triclinic
Question 23: The number of Cl– ions present around each Na+ ion in the NaCl crystal lattice is
(a) 3
(b) 4
(c) 8
(d) 6
Answer: (d) 6
Question 24: To get an n-type semiconductor from silicon, it should be doped with an element having valence electrons of
(a) 2
(b) 1
(c) 3
(d) 5
Answer: (d) 5
Question 25: Volume occupied by atoms in fee is
(a) 74%
(b) 68%
(c) 52.4%
(d) 75%
Answer: (a) 74%
Question 26: NaCl type crystal (with coordination no. 6: 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying
(a) high temperature
(b) high pressure
(c) high temperature and high pressure
(d) low temperature and low pressure
Answer: (b) high pressure
Question 27: Which one of the following is non-crystalline or amorphous?
(a) Diamond
(b) Graphite
(c) Glass
(d) Common Salt
Answer: (c) Glass
Question 28: NaCl type crystal (with coordination no. 6:6) can be converted into CsCl type crystal (with coordination no. 8:8) by applying
(a) high temperature
(b) high pressure
(c) high temperature and high pressure
(d) low temperature and low pressure
Answer: (b) high pressure
Question 29: How many chloride ions are surrounding sodium ions in sodium chloride crystal?
(a) 4
(b) 8
(c) 6
(d) 12
Answer: (c) 6
Question 30: In NaCl structure
(a) all octahedral and tetrahedral sites are occupied
(b) only octahedral sites are occupied
(c) only tetrahedral sites are occupied
(d) neither octahedral nor tetrahedral sites are occupied
Answer: (b) only octahedral sites are occupied
Question 31: In the Zinc blende structure
(a) zinc ions occupy half of the tetrahedral sites
(b) each Zn2- ion is surrounded by six sulphide ions
(c) each S2- ion is surrounded by six Zn2+ ions
(d) it has a fee structure
Answer: (c) each S2- ion is surrounded by six Zn2+ ions
Question 32: A unit cell of BaCl2 (fluorite structure) is made up of
(a) four Ba2+ ions and four Cl– ions
(b) four Ba2- ions and eight Cl– ions
(c) eight Ba² ions and four Cl– ions
(d) four Ba² ions and six Cl– ions
Answer: (b) four Ba2- ions and eight Cl– ions
Question 33: The density of a metal which crystallises in bcc lattice with unit cell edge length 300 pm and molar mass 50 g mol-1 will be
(a) 10 g cm-3
(b) 14.2 g cm-3
(c) 6.15 g cm-3
(d) 9.3 2 g cm-3
Answer: (c) 6.15 g cm-3
Question 34: How many lithium atoms are present in a unit cell with an edge length of 3.5 Å and density of 0.53 g cm-3? (Atomic mass of Li = 6.94):
(a) 2
(b) 1
(c) 4
(d) 6
Answer: (a) 2
Question 35: The distance between Na– and CL– ions in NaCl with a density of 2.165 g cm-3 is
(a) 564 pm
(b) 282 pm
(c) 234 pm
(d) 538 pm
Answer: (b) 282 pm
Question 36: An element with atomic mass 100 has a bcc structure and edge length of 400 pm. The density of elements is
(a) 10.37 g cm-3
(b) 5.19 g cm-3
(c) 7.29 g cm-3
(d) 2.14 g cm-3
Answer: (b) 5.19 g cm-3
Question 37: Fe3O4 (magnetite) is an example of
(a) normal spinel structure
(b) inverse spinel structure
(c) fluoride structure
(d) anti fluorite structure
Answer: (b) inverse spinel structure
Question 38: Which of the following crystals does not exhibit Frenkel defect?
(a) AgBr
(b) AgCl
(c) KBr
(d) ZnS
Answer: (c) KBr
Question 39: What type of stoichiometric defect is shown by ZnS?
(a) Schottky defect
(b) Frenkel defect
(c) Both Frenkel and Schottky defects
(d) Non-stoichiometric defect
Answer: (b) Frenkel defect
Question 40: Silver halides generally show
(a) Schottky defect
(b) Frenkel defect
(c) Both Frenkel and Schottky defects
(d) cation excess defect
Answer: (c) Both Frenkel and Schottky defects
Question 41: Which of the following will have metal deficiency defect?
(a) NaCl
(b) FeO
(c) KCl
(d) ZnO
Answer: (b) FeO
Question 42: In which pair most efficient packing is present?
(a) hep and bcc
(b) hep and CCP
(c) bcc and CCP
(d) bcc and simple cubic cell
Answer: (b) hep and CCP
Question 43: What is the effect of the Frenkel defect on the density of ionic solids?
(a) The density of the crystal increases
(b) The density of the crystal decreases
(c) The density of the crystal remains unchanged
(d) There is no relationship between the density of a crystal and the defect present in it
Answer: (c) The density of the crystal remains unchanged
Question 44: In a Schottky defect
(a) an ion moves to an interstitial position between the lattice points
(b) electrons are trapped in a lattice site
(c) some lattice sites are vacant
(d) some extra cations are present in interstitial space
Answer: (c) some lattice sites are vacant
Question 45: To get n-type of semiconductor, germanium should be doped with
(a) gallium
(b) arsenic
(c) aluminium
(d) boron
Answer: (b) arsenic
Question 46: P-type semiconductors are formed When Si or Ge are doped with
(a) group 14 elements
(b) group 15 elements
(c) group 13 elements
(d)group 18 elements
Answer: (c) group 13 elements
Question 47: 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
Answer: (b) Low temperature
