p - Block Elements - I Book Back Questions

12th Standard EM

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  1. The element that does not show catenation among the following p-block elements is

    (a)

    Carbon

    (b)

    silicon

    (c)

    Lead

    (d)

    germanium

  2. Oxidation state of carbon in its hydrides

    (a)

    +4

    (b)

    -4

    (c)

    +3

    (d)

    +2

  3. Which of the following is not sp2 hybridised?

    (a)

    Graphite

    (b)

    graphene

    (c)

    Fullerene

    (d)

    dry ice

  4. AlF3 is soluble in HF only in the presence of KF. It is due to the formation of (NEET)

    (a)

    K3[AIF3H3]

    (b)

    K3[AiF6]

    (c)

    AIH3

    (d)

    K[AIF3H]

  5. The stability of +1 oxidation state increases in the sequence

    (a)

    Al < Ga < In < Tl

    (b)

    Tl < In < Ga < Al

    (c)

    In < Tl < Ga < Al

    (d)

    Ga< In < Al < Tl

  6. 3 x 2 = 6
  7. Give the uses of Borax

  8. Write a note on Fisher tropsch synthesis

  9. Give the structure of CO and CO2.

  10. 3 x 3 = 9
  11. Describe the structure of diborane

  12. Give one example for each of the following
    (i) icosogens
    (ii) tetragen
    (iii) prictogen
    (iv) chalcogen

  13. Write a note on metallic nature of p-block elements

  14. 2 x 5 = 10
  15. How will you identify borate radical?

  16. A double salt which contains fourth period alkali metal (A) on heating at 500K gives (B). aqueous solution of (B) gives white precipitate with BaCl2 and gives a red colour compound with alizarin. Identify A and B.

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