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12th Chemistry - Solid State Model Question Paper

Solid State Model Question Paper

12th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    8 x 1 = 8

  1. The number of unit cells in 8 gm of an element X (atomic mass 40) which crystallizes in bcc pattern is (NA is the Avogadro number)________.

    (a)

    6.023 x 1023

    (b)

    6.023 x 1022

    (c)

    60.23 x 1023

    (d)

    \(\left( \frac { 6.023\times { 10 }^{ 23 } }{ 8\times 40 } \right) \)

  2. A solid compound XY has NaCl structure if the radius of the cation is 100pm, the radius of the anion will be ________.

    (a)

    \(\left( \frac { 100 }{ 0.414 } \right) \)

    (b)

    \(\left( \frac { 0.732 }{ 100 } \right) \)

    (c)

    100 x 0.414

    (d)

    \(\left( \frac { 0.414 }{ 100 } \right) \)

  3. If ‘a’ stands for the edge length of the cubic system sc, bcc, and fcc. Then the ratio of radii of spheres in these systems will be respectively ________.

    (a)

    \(\left( \frac { 1 }{ 2 } a;\frac { \sqrt { 3 } }{ 2 } a;\frac { \sqrt { 2 } }{ 2 } a \right) \)

    (b)

    \(\left( \sqrt { 1a } :\sqrt { 3a } :\sqrt { 2a } \right) \)

    (c)

    \(\left( \frac { 1 }{ 2 } a:\frac { \sqrt { 3 } }{ 4 } a:\frac { 1 }{ 2\sqrt { 2 } } a \right) \)

    (d)

    \(\frac { 1 }{ 2 } a:\sqrt { 3 } a:\frac { 1 }{ \sqrt { 2 } } a\)

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

    (a)

    NaCl

    (b)

    FeO

    (c)

    ZnO

    (d)

    KCl

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

    (a)

    Very low value of electrical conductivity in the molten state

    (b)

    Brittle nature

    (c)

    Very strong forces of attractions

    (d)

    Anisotropic nature

  6. The empty space between the shaded balls and hollow balls as shown in the diagram is called, _______.

    (a)

    Hexagonal void

    (b)

    Octahedral void

    (c)

    Tetrahedral void

    (d)

    Double triangular void

  7. For a solid with the following structure. The co-ordination number of the point B is_______.

    (a)

    3

    (b)

    4

    (c)

    5

    (d)

    6

    8. 1 x 1 = 1

  8. I. Gas molecules move randomly without exerting reasonable forces on one another.
    II. Covalent solids are held together by weak Vander waals forces.
    Ill. Molecules are held together by strong force of attraction.
    IV. Covalent solids are good thermal and electrical conductors.
    a) Only I
    b) Only II
    c) I, II & IV
    d) I & III

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    d) I & III

    9. 3 x 2 = 6

  9. Assertion: Total number of octahedral voids present in unit cell of cubic close packing including the one that is present at the body centre is four.
    Reason: Besides the body centre there is one octahedral void present at the centre of each of the six faced of the unit cell and each of which is shared between the adjacent unit cells.
    Codes:
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both the assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true but reason is false.
    d) Both assertion and reason are false

  10. Assertion: In Schottky defect, density of crystal decreases.
    Reason: Number of cations and anions are missing in Schottky defect are equal.
    Codes:
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both the assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true but reason is false.
    d) Both assertion and reason are false

  11. Assertion: The packing efficiency of fee structure is maximum
    Reason: The coordination number is 12 in fee structure.
    Codes:
    a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
    b) Both the assertion and reason are true but the reason is not the correct explanation of the assertion.
    c) Assertion is true but reason is false.
    d) Both assertion and reason are false.

    12. 2 x 2 = 4

  12. a) Co-ordination number of each sphere is 12 in hcp arrangements.
    b) Co-ordination number of each sphere is 8 in ccp arrangements.
    c) The cubic close packing is based on the face centered cubic unit cell.
    d) The structure of an ionic compound depends upon the stoichiometry.

  13. Which one of the following statement is wrong about Frenkel defect?
    a) An ion occupies an interstitial position
    b) Anion is much larger in size than the cation
    c) The crystal remains neutral
    d) Non-stoichiometric compound is formed

    14. 6 x 2 = 12

  14. Classify the following solids
    a. P4
    b. Brass
    c. diamond
    d. NaCl
    e. Iodine

  15. What are point defects?

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

  17. What is point defect in crystals?

  18. A compound made up of two atoms X and Y has a face centred cubic arrangement. X is present in the coners and Y at the centre of each face. If one atom is missing from corner. What is the simplest formula of the compound.

  19. The energy required to vapourise one mole of copper is smaller than that of energy required to vapourise 1 mole of diamond why?

    20. 3 x 3 = 9

  20. Explain AAAA and ABABA and ABCABC type of three dimensional packing with the help of neat diagram.

  21. Why are solids incompressible?

  22. A metallic element exists as a cubic lattice. Each edge of the unit cell is 2.88\(\mathring { A } \). The density of the metal is 7.20 g cm-3. How many unit cells there will be in 100g of the metal?

    23. 2 x 5 = 10

  23. An element has bcc structure with a cell edge of 288 pm. The density of the element is 7.2 g cm-3. How many atoms are present in 208 g of the element.

  24. Explain the following: Similarities and differences between metallic and ionic crystals.

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