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p - Block Elements - II Model Question Paper 1

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. On hydrolysis, PCl3 gives

    (a)

    H3PO3

    (b)

    PH3

    (c)

    H3PO4

    (d)

    POCl3

  2. The basicity of pyrophosphorous acid ( H4P2O5) is

    (a)

    4

    (b)

    2

    (c)

    3

    (d)

    5

  3. The correct order of the thermal stability of hydrogen halide is

    (a)

    HI > HBr > HCl > HF

    (b)

    HF > HCl > HBr > HI

    (c)

    HCl > HF > HBr > HI

    (d)

    HI > HCl > HF > HBr

  4. Thr hybridisation and shape of SF6 is respectively?

    (a)

    sp3d2,square planar

    (b)

    sp3d2,octahedral

    (c)

    sp3d see-saw

    (d)

    sp3d,trigonal bipyramindal

  5. Which one of the following orders is not in accordance with the property stated against it?

    (a)

    F2> CI2> Br2> I2:Bond dissociation energy

    (b)

    HI > HBr> HCI > HF : Acidic property in water

    (c)

    F2> Cl2> Br2> l2: Oxidising power

    (d)

    F2> Cl2> Br2> l2: Electronegativity

  6. 5 x 2 = 10
  7. Give the uses of helium.

  8. What is the hybridisation of iodine in IF7? Give its structure?

  9. What is phosphoresencer?

  10. Elements of group 16 show lower value of first ionization enthalpy compared to group 15, why?

  11. Why hydrides of oxygen is a liquid whereas hydride of sulphur is a gas?

  12. 5 x 3 = 15
  13. How will you prepare chlorine in the laboratory?

  14. Write the reason for the anamolous behaviour of Nitrogen.

  15. Write the valence shell electronic configuration of group-15 elements.

  16. Write the order of thermal stability of the hydrides of group 16 elements.

  17. Out of H2O and H2S which one has higher bond angle and why?

  18. 4 x 5 = 20
  19. Suggest a reason why HF is a weak acid, whereas binary acids of the all other halogens are strong acids.

  20. Deduce the oxidation number of oxygen in hypofluorous acid – HOF.

  21. Explain the structure of inter halogen compounds

  22. Why is dioxygen a gas but sulphur a solid?

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