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Solid State Model Question Paper

12th Standard

    Reg.No. :
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Chemistry

Time : 02:00:00 Hrs
Total Marks : 50
    10 x 1 = 10
  1. An ionic compound Ax By crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying corners of the cube the correct formula of Ax, By is ________.

    (a)

    AB

    (b)

    AB3

    (c)

    A3B

    (d)

    A8B6

  2. In calcium fluoride, having the fluorite structure the coordination number of Ca2+ ion and F- Ion are ________.

    (a)

    4 and 2

    (b)

    6 and 6

    (c)

    8 and 4

    (d)

    4 and 8

  3. The number of carbon atoms per unit cell of diamond is _______.

    (a)

    8

    (b)

    6

    (c)

    1

    (d)

    4

  4. CsCl has bcc arrangement, its unit cell edge length is 400pm, its inter atomic distance is ________.

    (a)

    400pm

    (b)

    800pm

    (c)

    \(\sqrt { 3 } \times 100pm\)

    (d)

    \(\left( \frac { \sqrt { 3 } }{ 2 } \right) \times 400pm\)

  5. The radius of an atom is 300pm, if it crystallizes in a face centered cubic lattice, the length of the edge of the unit cell is ________.

    (a)

    488.5pm

    (b)

    848.5pm

    (c)

    884.5pm

    (d)

    484.5pm

  6. Schottky defect in a crystal is observed when ______.

    (a)

    unequal number of anions 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 occupies an interstitial site

    (d)

    no ion is missing from its lattice

  7. The crystal with a metal deficiency defect is ________.

    (a)

    NaCl

    (b)

    FeO

    (c)

    ZnO

    (d)

    KCl

  8. In which of the following arrangements, octahedral voids are formed?

    (a)

    fcc

    (b)

    bcc

    (c)

    simple cubic

    (d)

    hcp

  9. What is the relation between diamond and graphite?

    (a)

    Polymorphous

    (b)

    Isomer

    (c)

    Isotope

    (d)

    Isomorphous

  10. A regular three dimensional arrangement of identical points in space is called _______.

    (a)

    Unit cell

    (b)

    Space lattice

    (c)

    Primitive

    (d)

    Crystallography

  11. 5 x 1 = 5
  12. Impurity defect 

  13. (1)

    NaCl with Sr2+ and some cationic sites vacant.

  14. Metal deficiency defect

  15. (2)

    a≠b≠c, ∝=૪=90o, β≠90o

  16. Schottky defect

  17. (3)

    NaCI

  18. Schottky defect

  19. (4)

    NaCI

  20. Monoclinic

  21. (5)

    FeO with Fe3+

    5 x 2 = 10
  22. Define unit cell.

  23. Give any three characteristics of ionic crystals.

  24. Explain briefly seven types of unit cell.

  25. Distinguish tetrahedral and octahedral voids.

  26. What are point defects?

  27. 5 x 3 = 15
  28. Explain Schottky defect.

  29. Calculate the number of atoms in a fcc unit cell.

  30. Why ionic crystals are hard and brittle?

  31. Calculate the percentage efficiency of packing in case of body centered cubic crystal.

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

  33. 2 x 5 = 10
  34. If NaCl is doped with 10-2 mol percentage of strontium chloride, what is the concentration of  cation vacancy?

  35. 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?

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