Solid State PYQs Set 3 (PDF)

Set 3 of 6 · Questions 61-90 of 153

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Mere Teacher · Previous Year Questions NEET Chemistry · Solid State · Set 3 (Q61-90)
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61. $1 mole of NaCl is doped with 10^{- 5} mole of SrCl_{2} . The number of cationic vacancies in the crystal lattice will be$ (1) $6.022 \times 10^{18}$ (2) $6.022 \times 10^{15}$ (3) $6.022 \times 10^{23}$ (4) $12.044 \times 10^{20}$ 62. $The number of atoms in 2.4 g of body centred cubic crystal with edge length 200 pm is (density = 10 g cm^{- 3}, N_{A} = 6 \times 10^{23} atoms / mol)$ (1) $6 \times 10^{22}$ (2) $6 \times 10^{20}$ (3) $6 \times 10^{23}$ (4) $6 \times 10^{19}$ 63. $An element has a face-centred cubic (fcc) structure with a cell edge of a. The distance between the centres of two nearest tetrahedral voids in the lattice is:$ (1) $2 a$ (2) $a$ (3) $\frac{a}{2}$ (4) $\frac{3}{2} a$ 64. $How many number of atoms are there in a cube based unit cell, having one atom on each corner and 2 atoms on each body diagonal of cube?$ (1) $4$ (2) $9$ (3) $8$ (4) $6$ 65. $CsCl crystallizes in body centred cubic lattice. If 'a' its edge length then which of the following expressions is correct?$ (1) $r_{C s^{+}} + r_{C l^{-}} = 3 a$ (2) $r_{C s^{+}} + r_{C l^{-}} = \frac{3 a}{2}$ (3) $r_{C s^{+}} + r_{C l^{-}} = \frac{3}{2} a$ (4) $r_{C s^{+}} + r_{C l^{-}} = 3 a$ 66. $In a face centred cubic arrangement of A and B atoms in which ' A' atoms are at the corners of the unit cell and ' B' atoms are at the face centers. One of the ' A' atoms is missing from one corner in unit cell.The simplest formula of compound is$ (1) $A B_{3}$ (2) $A_{7} B_{24}$ (3) $A_{7} B_{8}$ (4) $A7B12$ 67. $Silver forms CCP structure and it's density is 10.5 g / cm^{3} . What is the edge length of unit cell. (molar mass of silver is 107.9 g / mol)$ (1) $3 0.68 Å$ (2) $348 Å$ (3) $3 68.1 Å$ (4) $3680 Å$ 68. $A solid having density of 9 \times 10^{3} kg m^{- 3} forms face centred cubic crystals of edge length 2002 pm. What is the molar mass of the solid ? [Avogadro constant \approx 6 \times 10^{23} mol^{- 1}, π \approx 3]$ (1) $0.0432 kg mol^{- 1}$ (2) $0.0216 kg mol^{- 1}$ (3) $0.0305 kg mol^{- 1}$ (4) $0.4320 kg mol^{- 1}$ 69. $Out of seven crystal systems, how many have face-centred unit cells?$ (1) $1$ (2) $2$ (3) $3$ (4) $4$ 70. $A compound is formed by elements A and B . This crystallises in the cubic structure where the A atoms are at the corners of the cube and B atoms are at the body centres. The simplest formula of the compound is$ (1) $A_{8} B_{4}$ (2) $A B_{6}$ (3) $AB$ (4) $A_{6} B$ 71. $Ag crystallizes in fcc lattice. What is the total number of tetrahedral voids present in 540 g of Ag metal? (N_{A} =) Avagadro number; Ag atomic weight = 108 g mol^{- 1})$ (1) $10 N_{A}$ (2) $20 N_{A}$ (3) $40 N_{A}$ (4) $60 N_{A}$ 72. $The ratio of number of atoms present in a simple cubic, body centred cubic and face centred cubic structure are, respectively :$ (1) $8:1:6$ (2) $1:2:4$ (3) $4:2:1$ (4) $4:2:3$ 73. $Iron crystalizes in FCC with an edge length of 400 pm . If it contains 0.1 % Schottky defects, calculate its approximate density [AW of Fe = 56 g / mol]$ (1) $5.8 g / cm^{3}$ (2) $1.5 g / cm^{3}$ (3) $2.9 g / cm^{3}$ (4) $8.5 g / cm^{3}$ 74. $The angle between (100) and (110) planes of fcc lattice is$ (1) $90^{\circ}$ (2) $0^{\circ}$ (3) $45^{\circ}$ (4) $120^{\circ}$ 75. $Calculate the edge length of bcc unit cell if radius of metal atom is 227 pm .$ (1) $4.54 \times 10^{- 8} cm$ (2) $5.24 \times 10^{- 8} cm$ (3) $6.42 \times 10^{- 8} cm$ (4) $1.135 \times 10^{- 8} cm$ 76. $A compound is formed by elements A, B and O . Atoms of oxygen form ccp lattice. Atoms of A (cation) occupy \frac{1}{8}^{th} of tetrahedral voids and atoms of B (cation) occupy half of octahedral voids. What is the molecular formula of the compound?$ (1) $A_{2} BO_{4}$ (2) $ABO_{2}$ (3) $AB_{2} O_{4}$ (4) $ABO_{3}$ 77. $KBr has rock salt type structural arrangements and has a density of 3.70 g / cm^{3} . The edge length of the unit cell is approximately [molecular weight of KBr = 120 g / mol]$ (1) $3 \times 10^{- 8} cm$ (2) $12 \times 10^{- 8} cm$ (3) $9 \times 10^{- 8} cm$ (4) $6 \times 10^{- 8} cm$ 78. $The anions (A) of C_{p} A_{q} molecule forms an fcc lattice. Cations (C) are positioned at the body center and half of the edge centers. The formula of the molecule is$ (1) $CA$ (2) $CA_{2}$ (3) $C_{3} A_{4}$ (4) $C_{5} A_{8}$ 79. $F-centres are formed in NaCl crystal if it is heated with Na vapour. The above is due to$ (1) $Schottky defect$ (2) $Dislocation defect$ (3) $Metal excess defect$ (4) $Metal deficiency defect$ 80. $If 0.5 mol of a metal forms hexagonal close packed structure, the total number of voids, and tetrahedral voids respectively in mol are$ (1) $1.5, 1.0$ (2) $1.0, 0.5$ (3) $1.0, 1.5$ (4) $0.5, 1.0$ 81. $An ionic compound is expected to have tetrahedral structure if r^{+} / r^{-} lies in the range of$ (1) $0.155 to 0.225$ (2) $0.732 to 1$ (3) $0.414 to 0.732$ (4) $0.225 to 0.414$ 82. $The number of network solids and ionic solids in the list given below is respectively H_{2} O (ice), AlN, Cu, CaF_{2}, diamond, MgO, CCl_{4}, ZnS, Ag, NaCl, SiO_{2}$ (1) $3,3$ (2) $3,4$ (3) $4,4$ (4) $4,3$ 83. $A metal crystallises in bcc lattice with unit cell edge length of 300 pm and density 6.15 g cm^{- 3} . The molar mass of the metal is$ (1) $50 g mol^{- 1}$ (2) $60 g mol^{- 1}$ (3) $40 g mol^{- 1}$ (4) $70 g mol^{- 1}$ 84. $In face centered cubic unit cell, what is the volume occupied?$ (1) $\frac{4}{3} π r^{3}$ (2) $\frac{8}{3} π r^{3}$ (3) $\frac{16}{3} π r^{3}$ (4) $\frac{64 r ^{3}}{3 3}$ 85. $A compound of formula has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms :$ (1) $hcp lattice - A, \frac{2}{3} Tetragonal voids - B$ (2) $hcp lattice - A, \frac{1}{3} Tetragonal voids - B$ (3) $hcp lattice - B,23 Tetragonal voids -A$ (4) $hcp lattice - B,13 Tetragonal voids -A$ 86. $Volume occupied by single CsCI ion pair in a crystal is 7.014 \times 10^{- 23} cm^{3} . The smallest Cs - Cs internuclear distance is equal to length of the side of the cube corresponding to volume of one CsCl ion pair. The smallest Cs to Cs internuclear distance is nearly$ (1) $4.4Å$ (2) $4.3Å$ (3) $4Å$ (4) $4.5Å$ 87. $The contribution of particle at the edge centre of a particular unit cell is$ (1) $\frac{1}{2}$ (2) $\frac{1}{4}$ (3) $1$ (4) $\frac{1}{8}$ 88. $Which among the following elements does not exhibit ferromagnetic properties?$ (1) $Cr$ (2) $Fe$ (3) $Co$ (4) $Ni$ 89. $Which of the following statement is not correct?$ (1) $Packing efficiency of hcp and ccp lattices are identical$ (2) $Packing efficiency of fcc lattice > Packing efficiency of ccp lattice$ (3) $Packing efficiency of fcc lattice = Packing efficiency of ccp lattice$ (4) $Packing efficiency of hcp lattice = Packing efficiency of fcc lattice$ 90. $Match the column A (type of crystalline solid) with the column B (example for each type) : A B P. Molecular solid (i) SiC Q. Ionic solid (ii) Mg R. Metallic solid (iii) H_{2} O S. Network solid (iv) MgO$ (1) $P-(iii), Q-(i), R-(ii), S-(iv)$ (2) $P-(iv), Q-(iii), R-(ii), S-(i)$ (3) $P-(ii), Q-(iv), R-(iii), S-(i)$ (4) $P-(iii), Q-(iv), R-(ii), S-(i)$