Solid State Model Questions

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Graphite and diamond are

    (a)

    Covalent and molecular crystals

    (b)

    ionic and covalent crystals

    (c)

    both covalent crystals

    (d)

    both molecular crystals

  2. The number of carbon atoms per unit cell of diamond is

    (a)

    8

    (b)

    6

    (c)

    1

    (d)

    4

  3. The vacant space in bcc lattice unit cell is

    (a)

    48%

    (b)

    23%

    (c)

    32%

    (d)

    26%

  4. Which of the following cannot be regarded as molecular solid?

    (a)

    Silicon carbide

    (b)

    AIN

    (c)

    Diamond

    (d)

    All the above

  5. Which of the following is characteristic of ionic solids?

    (a)

    Very low value of electrical conductivity in the molten state

    (b)

    Brittie nature

    (c)

    Very strong forces of attractions

    (d)

    Anisotropic nature

  6. 5 x 2 = 10
  7. Explain briefly seven types of unit cell

  8. Distinguish tetrahedral and octahedral voids.

  9. Why do solids have a definite volume?

  10. Ionic solids conduct electricity in molten state but not in solid state. Explain.

  11. What is point defect in crystals?

  12. 5 x 3 = 15
  13. Calculate the percentage efficiency of packing in case of body centered cubic crystal.

  14. What is the two dimensional coordination number of a molecule in square close packed layer?

  15. Experiment shows that Nickel oxide has the formula Ni0.96.O1.00 What fraction of Nickel exists as of Ni2+ and Ni3+ ions?

  16. Why are solids rigid?

  17. Silver crystallines in fcc lattice. If edge length of the cell is 4.07 x 10-8 em and density is 10.5 g cm-3. Calculate the atomic mass of silver

  18. 4 x 5 = 20
  19. Atoms X and Y form bcc crystalline structure. Atom X is present at the corners of the cube and Y is at the centre of the cube. What is the formula of the compound?

  20. Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitable example.

  21. What are stoichiometric defects in ionic solids? Explain

  22. Write note on impurity defect?

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