Solid State Important Objective Question

1. Graphite is an example of –

        (a) Ionic Solid                     

        (b) Covalent Solid

        (c) Molecular Solid           

        (d) Metallic crystal 

2. What is the simplest formula of a solid whose cubic unit cell has the atom A at each corner, the atom B at each face centre and a C atom at the body centre–

        (a) AB₂C                               (b) A₂BC

        (c) AB₃C                               (d) ABC₃

3. Which is amorphous solid –

        (a) Rubber                (b) Plastic

        (c) Glass                   (d) All

4. The unit cell of a metallic element of atomic mass 108 and density 10.5g/cm³ is a cube with edge length of 409 pm. The structure of the crystal lattice is –

        (a) fcc                       (b) bcc

        (c) hcp                      (d) None of these

5. Close packing is maximum in the crystal which is –

        (a) Simple cube        (b) bcc

        (c) fcc                       (d) None of these

6. The number of atoms in 100 g of fcc crystal with density (d) = 10 g cm^-3 and edge length 200 pm is equal to

        (a) 3×10²⁵                 (b) 5×10²⁴

        (c) 1×10²⁵                 (d) 2×10²⁵

7. Wax is an example of

        (a) Ionic crystal   (b) Covalent crystal

        (c) Amorphous solid         

        (d) Metallic Crystal

8. Which among the following will show anisotropy –

        (a) Glass                   (b) Barium Chloride

        (c) Wood                  (d) Paper

9. In a close pack array of N spheres, the number of tetrahedral holes are –

        (a) 4 N                     (b) N/2

        (c) 2N                      (d) N

10. The number of atoms present in a simple cubic unit cell are –

        (a) 4                         (b) 3

        (c) 2                         (d) 1

11. In a close pack array of N spheres, the number of octahedral holes are –

        (a) 4 N                     (b) N/2

        (c) 2N                      (d) N

12. The maximum percentage of available volume that can be filled in a face centred cubic system by an atom is –

        (a) 74%                              (b) 68%

        (c) 34%                              (d) 26%

13. In a body centred cubic arrangement, the number of atoms per unit cell is –

        (a) 8                         (b) 2

        (c) 1                         (d) 4

14. The rank (effective atoms per unit cell) of a cubic unit cell is 4. The type of cell as –

        (a) Body centred       (b) Face Centred

        (c) Primitive             (d) None of these

15. 6 : 6 of NaCl coordination changes to 8: 8 coordination on –

        (a) Applying high P

        (b) increase in temperature

        (c) both (a) and (b)  

        (d) no effect on coordination number

16. TiCl has structure similar to CsCl, the co-ordination number of Ti⁺ is –

        (a) 4                         (b) 6

        (c) 10                       (d) 8

17. Which of the following defect, if present lowers the density of the crystal –

        (a) Frenkel       

        (b) Schottky

        (c) Interstitial cation          

        (d) Constitution of F- Centers

18. How many atoms are there in a unit cell of Mg which forms hexagonal crystals–

          (a) 4                       (b) 6

          (c) 12                     (d) 8

19. A solid is made of two elements X and Z. The atom Z are in C.C.P. arrangement while atoms X occupy all the tetrahedral sites. What is the formula of the compound-

        (a) XZ                      (b) XZ₂

        (c) X₂Z                     (d) Unpredictable

20. In a face centred cubic arrangement of A & B atoms whose A atoms are at the corner of the unit cell & B atoms at the face centres. One of the A atom is missing from one corner in unit cell. The simplest formula of compound is –

        (a) A₇B₃                   (b) AB₃

        (c) A₇B₂₄                  (d) A_7/8B₃

21. The vacant space in B.C.C unit cell is –

        (a) 32%                              (b) 10%

        (c) 23%                              (d) 46%

22. The structure of sodium chloride crystal is –

        (a) Body centred cubic lattice

        (b) Face centred cubic lattice

        (c) Octahedral                   

        (d) Square planar

23. Among solids highest melting point is established by –

        (a) Covalent solids  

       (b) Amorphous Solids

        (c) Ionic solids                  

        (d) Molecular solids

24. Which of the following does not exhibit frenkel defect

        (a) AgBr                   (b) AgCl

        (c) CsCl                    (d) ZnS

25. Total volume of atoms present in BCC unit cell of metal is (r=atomic radius)

        (a) 68%                  (b) 74%

        (c) 52%                   (d) 36%

26. The no. of atoms per unit cell in B.C.C & F.C.C is respectively –

        (a) 8, 10                   (b) 2, 4

        (c) 1, 2                     (d) 1, 3

27. In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3^rd of tetrahedral voids. The formula of the compound will be –

        (a) X₂Y₃                   (b) X₂Y

        (c) X₃Y₄                   (d) X₄Y₃

28. In Corundum, oxide ions are arrangement in hcp arrangement and aluminum ion occupy two third of the octahedral holes. Its formula is –

        (a) Al₂O₃                  (b) Al₂O₄

        (c) Al₃O₄                  (d) AlO₂

30.Crystals can be classified into …….. basic crystal habits

        (a) 3                          (b) 7

        (c) 14                        (d) 4

31. Doping of silicon (Si) with boron (B) leads to

        (a) n-type semiconductor     

        (b) p-type semiconductor  

         (c) Metal

         (d) Insulator

32. The empty space in this HCP unit cell-

         (a)  74%                   (b) 47.6%

        (c)  32%                    (d) 26%