1. Which of the following is an evample of covalent solid?

(a) Silicon carboide

(b) \(\mathrm{BaSO}_4\)

(c) Solid \(\mathrm{CO}_3\)

(d) Iodine

2. The number of basic types of unit cells among the erystal is

(a) Eight

(b) Fourteen

(c) Seven

(d) Ten

3. The number of atoms per unit cell in a body centered cubic arrangement is

(a) I

(b) 2

(c) 4

(d) 6

4. Which of the following is a molecular solid?

(a) \(\mathrm{MgO}\)

(b) \(\mathrm{Ag} \mathrm{Cl}\)

(c) \(\mathrm{CO}_2\)

(d) \(\mathrm{Pd}\)

5. The coordination number in a ccp arrangement of atoms is

(a) 12

(b) 8

(c) 6

(d) 4

6. The unit cell with crystallographic dimensions a \(=\mathrm{b} \neq c, a=\beta=\gamma=90\)

(a) Cubic

(b) Hexagonal

(c) Tetragonal

(d) Orthorhombic

7. Which one has highest melting point?

(a) ionic crystal

(b) Molecular crystal

(c) Covalent crystal

(d) Metallic crystal

8. Which of the following is not the property of crystalline solids?

(a) definite geometry

(b) sharp melting point

(c) isotropy

(d) anisotropy

9. In CsCl structure, the coordination number of \(\mathrm{Cs}^{+}\) and \(\mathrm{Cl}^{-1}\) ions are respectively

(a) 8,8

(b) 8,6

(c) 6,8

(d) 6,6

10. Which of the following transition metal oxides is diamagnetic?

(a) \(\mathrm{VO}\)

(b) \(\mathrm{V}_2 \mathrm{O}_3\)

(c) \(\mathrm{YO}_2\)

(d) \(\mathrm{V}_2 \mathrm{O}_5\)

11. An example of ferroelectric is

(a) Quartz

(b) Barium titanate

(c) Tourmaline

(d) Leed zirconate

12. A metal has face centered cubic arrangement. If length of the edge of the cell is \(\times \mathrm{pm}\) and \(\mathrm{M}\) is its atomic mass, then density will be equal to \(\left(\mathrm{N}_{\mathrm{n}}\right.\) is Avogadro number)

(a) \(\frac{\mathrm{M}}{\mathrm{x}^3 \times \mathrm{N}_0} \mathrm{gcm}^{-3}\)

(b) \(\frac{4 \mathrm{M}}{\mathrm{x}^2 \times \mathrm{N}_0} \mathrm{~g} \mathrm{~cm}^{-3}\)

(c) \(\frac{4 \mathrm{M}}{\mathrm{x}^3 \times \mathrm{N}_0} g \mathrm{gcm}^{-3}\)

(d) \(\frac{M}{4 x^3 \times N_0} g^{-1} \mathrm{~cm}^{-3}\)

13. The basic unit in pyrosillicates is

(a) \(\mathrm{SiO}_4{ }^{2-}\) (b) \(\left[\mathrm{Si}_3 \mathrm{O}_4\right]^{b-}\) (c) \(\left[\mathrm{SuO}_3^{2-}\right]_4\) (d) \(\left[\mathrm{Si}_2 \mathrm{O}_4\right]^{b-}\)

14. The arrangement in an ideal crystal ( \(\mathrm{AB}\) and a defect structured crystal is shown below \(\mathrm{A}^{+} \mathrm{B}^{-} \quad \mathrm{A}^{+} \mathrm{B}^{-} \quad \mathrm{A}^{+} \mathrm{B}^{-} \quad \mathrm{A}^{+} \mathrm{B}^{+}\)

\(\mathrm{A}^{+} \mathrm{B}^{-} \quad \mathrm{A}^{+} \mathrm{B}^{-} \quad \mathrm{A}^{+} \mathrm{B}^{-} \quad \mathrm{A}^{+} \mathrm{B}^{-}\)

\(\mathrm{B}^{-} \mathrm{A}^{+} \quad \mathrm{B}^{-} \mathrm{A}^{+} \quad \mathrm{B}^{-} \mathrm{A}^{+} \quad \mathrm{B}^{-} \mathbf{A}^{+}\)

(Ideal crystal) (Defect structure) This illustrates the example of

(a) Frenkel defect

(b) Schottky defect

(c) Metal excess defect

(d) Metal deficient defect

15. Which of the following transition metal oxides is not paramagnetic?

(a) \(\mathrm{TiO}\)

(b) \(\mathrm{CuO}\)

(c) \(\mathrm{VO}\)

(d) \(\mathrm{TiO}_2\)

16. If the alignment of magnetic moments in a substance is in a compensatiory way so as to give zero net magnetic moment, then the substance is said to be

(a) Ferromagnetic

(b) Anti-ferromagnetic

(c) Ferrimagnetic

(d) Diamagnetic

17. The number of oxygen atoms shared between silicon atoms in \(\mathrm{Si}_3 \mathrm{O}_9^{-}\)- ion is

(a) One

(b) Two

(c) Three

(d) \(\operatorname{Six}\)

18. When atoms are placed at the corners of all 12 edges of a cube, the number of atoms present per unit cell is

(a) 1

(b) 2

(c) 4

(d) 6

19. A compound formed by elements \(A\) and \(B\) has a cubic structure in which \(A\) atoms are at the corners of the cube and \(B\) atoms are at the face centres. The formula of the compound is

(a) \(\mathrm{AB}_3\)

\(\begin{array}{ll}\text { (b) } \mathrm{A}_2 \mathrm{~B}_3 & \text { (c) } \mathrm{A}_2 \mathrm{~B}\end{array}\)

(d) \(\mathrm{A}_4 \mathrm{~B}_3\)

20. One unit cell of \(\mathrm{NaCl}\) contains

(a) \(1 \mathrm{Na}^{+}\)and \(1 \mathrm{Cl}^{-}\)

(b) \(2 \mathrm{Na}^{+}\)and \(2 \mathrm{Cl}^{-}\)

(c) \(4 \mathrm{Na}^{+}\)and \(4 \mathrm{Cl}^{-}\)

(d) \(12 \mathrm{Na}^{+}\)and \(12 \mathrm{Cl}^{-}\)

21. An example of antiferroelectric substance is

(a) \(\mathrm{PbZrO}_3\) (b) \(\mathrm{BaTiO}_3\) (c) \(\mathrm{Fe}_3 \mathrm{O}_4\)

(d) \(\mathrm{KH}_2 \mathrm{PO}_4\)

22. Which of the following is an example of three dimensional silicates?

(a) quartz (b) talc

(c) asbestos (d) beryl

23. The number of \(\mathrm{NaCl}\) formula units in a unit cell of sodium chloride is

(a) 1

(b) 2

(c) 4

(d) 8

24. The most unsymmetrical unit cell is

(a) Monoclinic

(b) Triclinic

(c) Orthorhombic

(d) Tetragonal

25. Asbestos is an example of

(a) Island chain silicates

(b) Orthosilicates

(c) Chain silicates

(d) Cyclic silicates

26. Body centered cubic lattice has coordination number

(a) 6

(b) 8

(c) 10

(d) 12

27. Crystals can be described into basic crystal habits

(a) 7

(b) 4

(c) 14

(d) 3

28. Which of the following is having hexagonal close packed crystal structure?

(a) \(\mathrm{NaCl}\)

(b) \(\mathrm{CsCl}\)

(c) \(\mathrm{Zn}\)

(d) \(\mathrm{RbCl}\)

29. A metallic element crystallizes into a lattice containing a sequence of layers \(A B A B A B\) Any packing of spheres leaves out voids in the lattice. What percentage by volume of this lattice is empty space?

(a) \(74 \%\)

(b) \(20 \%\)

(c) \(50 \%\)

(d) none of these

30. A metal crystallizes in cubic close packed (cep). The atomic radius of metal is \(144 \mathrm{pm}\) and its atomic mass is 197 a.m.u. Its density is

(a) \(19.4 \mathrm{~g} \mathrm{~cm}^{-3}\)

(b) \(1.94 \mathrm{~g} \mathrm{~cm}^{-3}\)

(c) \(29.4 \mathrm{~g} \mathrm{~cm}^{-3}\)

(d) \(2.94 \mathrm{~g} \mathrm{~cm}^{-3}\)

31. In a close packing of atoms \(A\) of radius \(r_{\text {the }}\) the radius of atom \(B\) that can be fitted in tetrahedral void is

(a) \(0.225 \mathrm{r}_{\mathrm{a}}\) (b) \(0.155 \mathrm{r}_{\mathrm{a}}\) (c) \(0.414 \mathrm{r}_2\) (d) \(0.732 \mathrm{r}_3\)

32. The edge length of a cube is \(520 \mathrm{pm}\). Its body diagonal would be

(a) \(800.62 \mathrm{pm}\)

(b) \(900.64 \mathrm{pm}\)

(c) \(735.28 \mathrm{pm}\)

(d) \(520.0 \mathrm{pm}\)

33. Which of the following dimensions represent triclinic unit cell?

(a) \(a=b=c, \alpha=\beta=\gamma=90^{\circ}\)

(b) \(\mathrm{a}=\mathrm{b} \neq \mathrm{c}, \alpha=\beta=\gamma=90^0\)

(c) \(a \neq b \neq c, \alpha=\beta=\gamma=90^{\circ}\)

(d) \(a \neq b \neq c, \alpha \neq \beta \neq \gamma=90^{\circ}\)

34. In a primitive cubic lattice, the percentage of void volume is

(a) \(52.36 \%\) (b) \(25.95 \%\) (c) \(74.05 \%\) (d) \(47.64 \%\)

35. A mineral having the formula \(\mathbf{A B}\), crystallized in cubic closed packed lattice with the atoms \(A\) occupying lattice points. The co-ordination number of \(A\) atoms, that of \(B\) atoms and the fraction of the tetrahedral sites occupied by \(B\) atoms are

(a) \(2,6,75 \%\)

(b) \(8,4,100 \%\)

(c) \(3,1,25 \%\)

(d) \(6,6,50 \%\)

36. \(\mathrm{Fe}_3 \mathrm{O}_4\) is ferrimagnetic at room temperature but at \(850 \mathrm{~K}\) it becomes

(a) Diamagnetic

(b) Ferromagnetic

(c) Non-magnetic

(d) Paramagnetic

37. A substance \(A_x B_y\) crystallizes in a face centered cubic ( \(\mathrm{FCC})\) lattice in which atoms 'A' occupy each corner of the cube and atoms 'B' occupy the centers of each face of the cube. Identify the correct composition of the substance \(A_x B_y\)

(a) \(\mathrm{AB}_3\)

(b) \(\mathrm{A}_4 \mathrm{~B}_3^3\)

(c) \(\mathrm{A}_3 \mathrm{~B}^3\)

(d) Composition cannot be specified

38. Fraction of total volume occupied by atoms in a simple cubic cell is

(a) \(\frac{\pi}{2}\)

(b) \(\frac{\sqrt{3 \pi}}{8}\)

(c) \(\frac{\sqrt{2} \pi}{6}\)

(d) \(\frac{\pi}{6}\)

39. In a cubic crystal anions are arrangement in fcc arrangement and the cations occupy all the octahedral voids and half the tetrahedral voids. The ratio of the cations and anions in the crystal is

(a) \(1: 1\)

(b) \(2: 1\)

(c) \(1: 2\)

(d) \(3: 2\)

40. The number of atoms in \(100 \mathrm{~g}\) of the fcc crystal with density \(10 \mathrm{~g} \mathrm{~cm}^{-3}\) and edge length of \(200 \mathrm{pm}\) is

(a) \(1 \times 10^{25}\)

(b) \(5 \times 10^{24}\)

(c) \(5 \times 10^{26}\)

(d) \(5 \times 10^{20}\)

41. In a structure, A atoms have fcc arrangement. B atoms occupy all the tetrahedral slites and \(\mathrm{C}\) atoms occupy half the octahedral sides. The formula ofthe compound is

42. Schottky defect in crystal is observed when

(a) unequal number of cations and anions are missing from the lattice

(b) equal number of cations and anions are missing from the lattice

(c) an ion leaves its normal site and occpies an intestitial site

(d) density of the crystal is increased

43. When molten zinc is cooled to solid state, it assumes hcp structure. Then the number of nearest neighbours of zinc atom will be

(a) 4

(b) 6

(c) 8

(d) 12

44. The pykno meter density of sodium chloride crystal is \(2.165 \times 10^3 \mathrm{~kg} \mathrm{~m}^{-3}\) while its X-ray density \(2.178 \times 10^3 \mathrm{~kg} \mathrm{~m}^{-3}\).

(a) 5.96

(b) \(5.96 \times 10^{-2}\)

(c) \(5.96 \times 10^{-1}\)

(d) \(5.96 \times 10^{-3}\)

45. CsBr crystallizes in a body centered cubic lattice. The unit cell lengths is \(436.6 \mathrm{pm}\). Given that the atomic mass of \(\mathrm{Cs}=133\) and that of \(\mathrm{Br}=80 \mathrm{amu}\) and Avogadro number being \(6.02 \times 10^{23} \mathrm{~mol}^{-1}\). The density of \(\mathrm{CsBr}\) is

(a) \(0.425 \mathrm{~g} \mathrm{~cm}^{-3}\)

(b) \(8.25 \mathrm{~g} \mathrm{~cm}^{-3}\)

(c) \(4.25 \mathrm{~g} \mathrm{~cm}^{-3}\)

(d) \(42.5 \mathrm{~g} \mathrm{~cm}^{-3}\)

46. In a face centered cubic lattice, a unit cell is shared equally by how many unit cells?

(a) 2

(b) 4

(c) 6

(d) 8

47. If \(\mathrm{NaCl}\) is doped with \(10^{-4} \mathrm{~mol} \%\) of \(\mathrm{SrCl}_2\), the concentration of cation vacancies will be ( \(\mathrm{NA}=\) \(6.022 \times 10^{23} \mathrm{~mol}^{-1}\) )

(a) \(6.02 \times 10^{16} \mathrm{~mol}^{-1}\)

(b) \(6.02 \times 10^{17} \mathrm{~mol}^{-1}\)

(c) \(6.02 \times 10^{14} \mathrm{~mol}^{-1}\)

(d) \(6.02 \times 10^{15} \mathrm{~mol}^{-1}\)

48. the fraction of total volume occupied by the atoms present in a simple cube is

(a) \(\frac{\pi}{3 \sqrt{2}}\)

(b) \(\frac{\pi}{4 \sqrt{2}}\)

(c) \(\frac{\pi}{4}\)

(d) \(\frac{\pi}{6}\)

49. How many unit cells are present in a cube shaped ideal crystal of \(\mathrm{NaCl}\) of mass \(1.0 \mathrm{~g}\) ?

(a) \(5.14 \times 10^{21}\)

(b) \(1.28 \times 10^{21}\)

(c) \(1.71 \times 10^{21}\)

(d) \(2.57 \times 10^{21}\)

50. In which of the following crystals alternate tetrahedral voids are occupied?

(a) \(\mathrm{NaCl}\)

(b) \(\mathrm{ZnS}\)

(c) \(\mathrm{CaF}_2\)

(d) \(\mathrm{Na}_2 \mathrm{O}\)