Solid State PYQs Set 2 (PDF)

Set 2 of 6 · Questions 31-60 of 153

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Mere Teacher · Previous Year Questions NEET Chemistry · Solid State · Set 2 (Q31-60)
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31. $The density of Na is 0.613 g cm^{- 3} . If the edge length of unit cell of Na is 5Å, the effective number of atoms of Na per unit cell is (Atomic weight of Na = 23 u)$ (1) $8$ (2) $1$ (3) $2$ (4) $4$ 32. $A metal crystallises in a body centered cubic lattice with the metallic radius 3 A . The volume of the unit cell in m^{3} is$ (1) $64\times 1 0^{- 29}$ (2) $4 \times 10^{- 29}$ (3) $6.4\times 1 0^{- 29}$ (4) $4 \times 10^{- 10}$ 33. $The correct statement regarding defects in solid is$ (1) $Frenkel defect is a vacancy defect$ (2) $Schottky defect is a dislocation defect$ (3) $trapping of an electron in the lattice leads to the formation of F centre$ (4) $Schotky defect has no effect on density.$ 34. $The number of tetrahedral and octahedral voids in CCP unit cell are respectively$ (1) $4,8$ (2) $8,4$ (3) $12,6$ (4) $6,12$ 35. $LiCoO_{2} crystallises in a rhomobohedral structure. Consider a situation where 50 % lithium (Li) is extracted from the lattice. To keep the crystal electrically neutral, change in average oxidation state of Co is$ (1) $16.66 % decrease$ (2) $16.66 % increase$ (3) $50 % increase$ (4) $50 % decrease$ 36. $If an element having atomic number 96 crystallises in cubic lattice with a density of 10.3 g cm^{- 3} and the edge length of 314 pm then, the structure of solid is$ (1) $hcp$ (2) $fcc$ (3) $bcc$ (4) $simple cubic$ 37. $Element ‘B’ forms ccp structure and ‘A’ occupies half of the octahedral voids, while oxygen atoms occupy all the tetrahedral voids. The structure of bimetallic oxide is:$ (1) $A_{2} B O_{4}$ (2) $A B_{2} O_{4}$ (3) $A_{2} B_{2} O$ (4) $A_{4} B_{2} O$ 38. $If the length of the body diagonal of a FCC unit cell is x Å, the distance between two octahedral voids in the cell in Å is$ (1) $\frac{x}{2}$ (2) $\frac{x}{3}$ (3) $\frac{x}{6}$ (4) $\frac{x}{8}$ 39. $Given below are two statements. Statement I: Frenkel defects are vacancy as well as interstitial defects. Statement II: Frenkel defect leads to colour in ionic solids due to presence of F-centres. Choose the most appropriate answer for the statements from the options given below:$ (1) $Statement I is false but Statement II is true$ (2) $Both Statement I and Statement II are true$ (3) $Statement I is true but Statement II is false$ (4) $Both Statement I and Statement II are false$ 40. $In the -ray reflection , the distance between two parallel planes of is and diffraction angle is . What is the wavelength of it's light radiation (Sin )$ (1) $0.504 A^{\circ}$ (2) $5.04 A^{\circ}$ (3) $50.4 A^{\circ}$ (4) $504 A^{\circ}$ 41. $Match List I with List II List I (Type of solid) (A) Metallic (B) Ionic (C) Molecular (D) Covalent List II (Example) (1) Diamond (2) Ice (3) NaCl (4) Cu A B C D$ (1) $4321$ (2) $4312$ (3) $3421$ (4) $3412$ 42. $Select a ferromagnetic material from the following.$ (1) $Dioxygen$ (2) $Chromium(IV) oxide$ (3) $Benzene$ (4) $Dihydrogen monoxide$ 43. $Select the correct statements.(A) Crystalline solids have long range order.(B) Crystalline solids are isotropic.(C) Amorphous solid are sometimes called pseudo solids.(D) Amorphous solids soften over a range of temperatures.(E) Amorphous solids have a definite heat of fusion. Choose the most appropriate answer from the options given below.$ (1) $(A), (B), (E) only$ (2) $(B), (D) only$ (3) $(C), (D) only$ (4) $(A), (C), (D) only$ 44. $Which metal among the following has the highest packing efficiency?$ (1) $Iron$ (2) $Tungsten$ (3) $Aluminium$ (4) $Polonium$ 45. $Percentages of free space in cubic close packed structure and in body centred packed structure are respectively$ (1) $32 % and 48 %$ (2) $48 % and 26 %$ (3) $30 % and 26 %$ (4) $26 % and 32 %$ 46. $Which of the following expressions is correct in case of a CsCl unit cell (edge length ' a')?$ (1) $r_{Cs^{+}} + r_{Cl^{-}} = \frac{3}{2} a$ (2) $r_{Cs^{+}} + r_{Cl^{-}} = \frac{a}{2}$ (3) $r_{Cs^{+}} + r_{Cl^{-}} = a$ (4) $r_{Cs^{+}} + r_{Cl^{-}} = \frac{a}{2}$ 47. $In a solid 'AB' having the NaCl structure, 'A' atoms occupy the corners of the cubic unit cell. If all the face centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is$ (1) $A B_{2}$ (2) $A_{2} B$ (3) $A_{4} B_{3}$ (4) $A_{3} B_{4}$ 48. $Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance?$ (1) (2) (3) (4) 49. $Which primitive unit cell has unequal edge lengths (a \neq = b \neq = c) and all axial angles different from 90°?$ (1) $Triclinic$ (2) $Hexagonal$ (3) $Monoclinic$ (4) $Tetragonal$ 50. $A body centred cubic lattice is made up of two different types of atoms X and Y. Atom X occupies the body centre and atoms Y occupy the corner positions. One of the corners is left unoccupied per unit cell. The empirical formula of it is$ (1) $X_{2} Y_{3}$ (2) $X_{8} Y_{7}$ (3) $X_{7} Y_{8}$ (4) $X_{5} Y_{7}$ 51. $Which metal crystallises in a simple cubic structure?$ (1) $Polonium$ (2) $Copper$ (3) $Nickel$ (4) $Iron$ 52. $A diatomic molecule X_{2} has a body-centred cubic (bcc) structure with a cell edge of 300 pm The density of the molecule is 6.17 g cm^{- 3} . The number of molecules present in 200 g of X_{2} is : (Avogadro constant (N_{A}) = 6 \times 10^{23} mol^{- 1})$ (1) $40 N_{A}$ (2) $4 N_{A}$ (3) $2 N_{A}$ (4) $8 N_{A}$ 53. $The correct relationships between unit cell edge length ' a' and radius of sphere ' r' for face-centred and body-centered cubic structures respectively are:$ (1) $r = 22 a and 3 r = 4 a$ (2) $r = 22 a and 4 r = 3 a$ (3) $22 r = a and 3 r = 4 a$ (4) $22 r = a and 4 r = 3 a$ 54. $A crystalline solid X Y_{3} has ccp arrangement for its element Y . X occupies$ (1) $66 % of tetrahedral voids$ (2) $33 % of tetrahedral voids$ (3) $66 % of octahedral voids$ (4) $33 % of octahedral voids.$ 55. $In which of the following compounds the cations are present in alternate tetrahedral voids$ (1) $NaCl$ (2) $ZnS$ (3) $C a F_{2}$ (4) $N a_{2} O$ 56. $A compounds of formula has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms;$ (1) $hcp lattice -A, \frac{2}{3} Tetrahedral voids-B$ (2) $hcp lattice -B, \frac{1}{3} Tetrahedral voids-A$ (3) $hcp lattice -B, \frac{2}{3} Tetrahedral voids-A$ (4) $hcp lattice -A, \frac{1}{3} Tetrahedral$ 57. $In the face centred unit cell, the lattice points are present at$ (1) $only the corners of the unit cell$ (2) $the corners and the centre of the unit cell$ (3) $the corners and the face centres of the unit cell$ (4) $only the face centres of the unit cell$ 58. $Calculate the density of metal having molar mass 210 g mol^{- 1} that forms simple cubic unit cell (a^{3} \cdot N_{A} = 21.5 cm^{3} mol^{- 1})$ (1) $9.77 g cm^{- 3}$ (2) $8.12 g cm^{- 3}$ (3) $7.15 g cm^{- 3}$ (4) $6.94 g cm^{- 3}$ 59. $Which of the following compounds is metallic and ferromagnetic?$ (1) $C r O_{2}$ (2) $V O_{2}$ (3) $M n O_{2}$ (4) $T i O_{2}$ 60. $A metal exists as an oxide with formula M_{0.96} O. Metal M can exist as M^{+ 2} and M^{+ 3} in its oxide M_{0.96} O . The percentage of M^{+ 3} in the oxide is, nearly$ (1) $4.6 %$ (2) $5 %$ (3) $9.6 %$ (4) $8.3 %$