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Chemical bonding Model Question Paper

11th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Find out the most favourable condition for electrovalent bonding.

    (a)

    Low ionization potential of one atom and high electron affinity of the other atom.

    (b)

    High electron affinity and high ionisation potential of both the atoms.

    (c)

    Low electron affinity and low ionisation potential of both the atoms.

    (d)

    High ionisation potential of one atom and low electron affinity of the other atom.

  2. The sharing of valence electrons between the atoms will lead to the formation of_____

    (a)

    Ionic bond

    (b)

    Covalent bond

    (c)

    Co-ordinate bond

    (d)

    Hydrogen bond

  3. Which compound has planar structure?

    (a)

    XeF4

    (b)

    XeOF2

    (c)

    XeO2F2

    (d)

    XeO4

  4. H2O is polar, whereas BeF2 is not It is because

    (a)

    The electronegativity of F is greater than that of O.

    (b)

    H2O involves hydrogen bonding whereas BeF2 is a discrete molecule

    (c)

    H2O is linear and BeF2 is angular

    (d)

    H2O is angular and BeF2 is linear

  5. Which of the following is a polar molecule?

    (a)

    BF3

    (b)

    SiF4

    (c)

    SF4

    (d)

    XeF4

  6. 5 x 2 = 10
  7. Give two cations that exhibit sp3 hybridisation.

  8. Give two examples of molecules undergoing sp3d2 hybridisation and predict their shapes.

  9. Draw the Lewis structure of N, C,O and He

  10. Write short note on classification of chemical bonds.

  11. Does H2O and H2S possess same bond, angle? Explain

  12. 5 x 3 = 15
  13. What is covalent bond? Give suitable examples to represent single, double and triple covalent bonds.

  14. Define co-ordinate covalent bond.

  15. Comment on the following statements. .
    (i) BF3 is planar but NH3 is not.
    (ii) SiF4 and C/O-4 are tetrahedral
    (iii) HSH bond angle in H2S is 92° and HOH bond angle in H20 is 104.5.

  16. Give reasons for the following:
    (i) Covalent bonds are directional while ionic bonds are non-directional.
    (ii) Water molecule has bent structure where as CO2 has linear structure.
    (iii) Ethyne molecule is linear

  17. Identify tbe paramagnetic species among following using molecular orbital theory.

  18. 4 x 5 = 20

  19. Comment and explain your observation obtained from the above graph.

  20. Draw the Lewis dot structure for the following.
    (i) SO3
    (ii) NH3
    (iii) CH4
    (iv) N2O5
    v) HNO3

  21. Explain about Kossel-Lewis approach to chemical bonding.

  22. Explain about valence bond theory for the formation of H2 molecule.

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