Chapter-1 Solid State MCQs
Q 41.: A metal crystallises in a CCP structure. Its metallic radius is 141.5 pm. The number of unit cells in 64 cm3 of metal are
(A) 1 × 1024
(B) 1 × 1022
(C) 1 × 1023
(D) 1 × 1032
Option – B
Q 42.: Which of the following crystal system has only primitive Bravais lattice ?
(A) Tetragonal
(B) Orthorhombic
(C) Monoclinic
(D) Rhombohedral
Option – D
Q 43.: Aluminium crystallises in a FCC structure. Atomic radius of the metal is 125 pm. The edge length of the unit cell of the metal is:
(A) 353.3 pm
(B) 176.75 pm
(C) 153.03 pm
(D) 121.5 pm
Option – A
Q 44.: How many unit cells are present in 23 grams of sodium if it has a BCC lattice ?
(A) 3.01 × 1023
(B) 6.02 × 1023
(C) 3.01 × 1022
(D) 6.02 × 1022
Option – A
Q 45.: Two ions A+ and B– have ionic radii 88 pm and 200 pm respectively. What is the coordination number of A+ in a close-packed structure ?
(A) 3
(B) 4
(C) 6
(D) 8
Option – C
Q 46.: One unit cell of NaCl contains:
(A) 1 Na+ and 1 Cl–
(B) 2 Na+ and 2 Cl–
(C) 4 Na+ and 4 Cl–
(D) 6 Na+ and 6 Cl–
Option – C
Q 47.: ZnO becomes yellow on heating because :
(A) Oxygen and electrons move out of the crystal and Zinc ion exhibit yellow colour.
(B) Zinc ions and electrons are entrapped into the interstitial sites. Due to presence of electrons in the interstitial sites, the colour is yellow.
(C) Zinc ions are replaced by Oxide ions giving yellow colour.
(D) Zinc ion again combine with oxygen to form yellow colour.
Option – B
Q 48.: In which of the following set, both are molecular solids ?
(A) Ice and solid SO2
(B) ZnS and solid CH4
(C) KCl and CaF2
(D) SiC and NaCl
Option – A
Q 49.: Total number of vacant tetrahedral and octahedral sites in a unit cell of ZnS is :
(A) 4
(B) 6
(C) 8
(D) 12
Option – C
Q 50.: Parameters for monoclinic crystal system are……………
(A) a ≠ b ≠ c and α = β = γ = 90˚
(B) a ≠ b ≠ c and α = γ = 90˚ β ≠ 90˚
(C) a ≠ b ≠ c and α ≠ β ≠ γ ≠ 90˚
(D) a = b = c and α = β = γ ≠ 90˚
Option – B
Q 51.: The percentage of empty space in BCC arrangement is :
(A) 68 %
(B) 74 %
(C) 26 %
(D) 32 %
Option – D
Q 52.: A solid has a cubic lattice in which ‘P’ atoms are present at the corners of the unit cell, ‘Q’ atoms are located at the cube edges and ‘R’ atoms are present at face centres. The formula of the compound is:
(A) PQ3R3
(B) PQ3R
(C) PQR3
(D) P2QR3
Option – A
Q 53.: The coordination number of metal crystallises in a HCP arrangement is :
(A) 6
(B) 8
(C) 10
(D) 12
Option – D
Q 54.: A crystal system with axis a=b=c and angles α=β=γ≠90˚ corresponds to:
(A) Tetragonal
(B) Orthorhombic
(C) Rhombohedral
(D) Monoclinic
Option – C
Q 55.: How many number of unit cells are present in 1.0 gm of NaCl.
(A) 1.71 × 1021
(B) 2.57 × 1021
(C) 1.28 × 1021
(D) 5.14 × 1021
Option – B
Q 56.: Total volume of atoms present in FCC unit cell of metal is :
(A) \frac{8\pi r^{3}}{3}
(B) \frac{12\pi r^{3}}{3}
(C) \frac{16\pi r^{3}}{3}
(D) \frac{64\pi r^{3}}{3}
Option – C
Q 57.: For tetrahedral co-ordination, the radius ratio should be:
(A) 0.155 – 0.225
(B) 0.225 – 0.414
(C) 0.414 – 0.732
(D) 0.732 – 1.00
Option – B
Q 58.: Silver is crystallising in face-centred cubic lattice. Calculate the number of unit cell in 54g of Silver. (Ag = 108 amu)
(A) 30.1 x 1022
(B) 15.05 x 1022
(C) 10.03 x 1022
(D) 7.525 x 1022
Option – B
Q 59.: Which of the following statement is false about octahedral voids
(A) Void size = 0.225 x radius of sphere
(B) They are located on edge centre of F.C.C. lattice.
(C) Void size = 0.414 x radius of sphere
(D) They are double triangular, uncovered voids.
Option – A
Q 60.: ABABAB…. type lattice arrangement is present in ………
(A) Hexagonal close packing in 3D by covering tetrahedral voids
(B) Hexagonal close packing in 3D by covering octahedral voids
(C) Square close packing in 3D
(D) Both 1 and 2
Option – A
Q 61.: Predict the structure of MgO crystal and coordination number of its cation in which cation and anion radii are equal to 65 pm and 140 pm respectively.
(A) 3, triangular planar
(B) 4, tetrahedral
(C) 6, Octahedral
(D) 8, Cubic
Option – C
Q 62.: A compound is found to contain calcium atoms at the corner, oxygen atoms at the face centres and titanium atom at the centre of the cube. Oxidation number of titanium in the mineral is :
(A) +1
(B) +2
(C) +3
(D) +4
Option – D
Q 63.: Which of the following is an amorphous solids :
(A) Quartz glass
(B) Graphite
(C) Silicon carbide
(D) Chrome alum
Option – A
Q 64.: Which of the following is true about the value of refractive index of quartz glass ?
(A) Different in different directions
(B) Same in all directions
(C) Cannot be measured
(D) Always zero
Option – B
Q 65.: 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) Same arrangement of constituent particles in different directions.
(C) Both A and B
(D) A regular arrangement of constituent particles observed over a long distance in the crystal lattice.
Option – D
Q 66.: Iodine molecules are held in the crystal lattice by ________
(A) London forces
(B) Dipole-dipole forces
(C) Covalent bonds
(D) Coulombic forces
Option – A
Q 67.: Which of the following oxides behaves as conductor or insulator depending upon temperature ?
(A) TiO
(B) SiO2
(C) TiO3
(D) MgO
Option – C
Q 68.: Cations are present in the interstitial site in _______
(A) Frenkel defect
(B) Schottky defect
(C) Impurity defect
(D) Metal deficiency defect
Option – A
Q 69.: Which of the following is true about the charge acquired by p-type semiconductor ?
(A) Negative
(B) Positive
(C) Neutral
(D) Depends on concentration of electron-deficit impurity
Option – C
Q 70.: In which pair most efficient packing is present ?
(A) HCP and BCC
(B) HCP and FCC
(C) BCC and FCC
(D) BCC and Simple cubic
Option – B
Q 71.: Which of the following statement is not true about the hexagonal close packing ?
(A) The coordination number is 12.
(B) It has 74% packing efficiency.
(C) Tetrahedral voids of the second layer are covered by the spheres of the third layer
(D) Octahedral voids of the second layer are covered by the spheres of the third layer
Option – D
Q 72.: Which kind of defects are introduced by doping ?
(A) Dislocation defect
(B) Schottky defect
(C) Frenkel defect
(D) Electronic defect
Option – D
Q 73.: Which of the following is not true about the ionic solids ?
(A) Bigger ions form the close packed structure.
(B) The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids.
(C) Smaller ions occupy either the tetrahedral or the octahedral voids depending upon their size.
(D) Occupation of all the voids is not necessary.
Option – B
Q 74.: The ionic radii of K+1, Rb+1 and Br-1 are 137, 148 and 195 pm respectively. The coordination number of cation in RbBr and KBr structures are respectively.
(A) 8, 6
(B) 6, 4
(C) 6, 8
(D) 4, 6
Option – A
Q 75.: The number of Cl-1 ions present around each Na+1 ion in NaCl crystal lattice is:
(A) 3
(B) 4
(C) 6
(D) 8
Option – C
Q 76.: In CaF2 structure, Ca+2 ions form CCP arrangement and F-1 ions occupy:
(A) All tetrahedral voids
(B) All octahedral voids
(C) Half tetrahedral voids
(D) Half octahedral voids
Option – A
Q 77.: A Face Centered Cubic lattice has edge length of 400 pm. The molar volume of the lattice including all the empty space is:
(A) 8.6 ml
(B) 9.64 ml
(C) 10.96 ml
(D) 11.62 ml
Option – B
Q 78.: Experimentally it was found that a metal oxide has formula M0.98O1. Metal ‘M’ exhibit variable oxidation state of +2 and +3. Fraction of the metal which exists as M+3 would be:
(A) 7.01 %
(B) 4.08 %
(C) 6.05 %
(D) 5.08 %
Option – B
Q 79.: Lattice defects per 1016 NaCl is 1. The number of defects in 1 mole of NaCl is:
(A) 6.02 x 1023
(B) 6.02 x 107
(C) 1.66 x 1020
(D) 1.66 x 108
Option – B
Q 80.: Which of the following is a non-stoichiometric defect ?
(A) Frenkel defect
(B) Schottky defect
(C) Metal deficiency defect
(D) Impurity defect
Option – C