p - Block Elements - I Important Questions

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. An aqueous solution of borax is

    (a)

    neutral

    (b)

    acidic

    (c)

    basic

    (d)

    amphoteric

  2. Boric acid is an acid because its molecule (NEET)

    (a)

    contains replaceable H+ ion

    (b)

    gives up a proton

    (c)

    combines with proton to form water molecule

    (d)

    accepts OH- from water ,releasing proton.

  3. Which among the following is not a borane?

    (a)

    B2H6

    (b)

    B3H6

    (c)

    B4H10

    (d)

    none of these

  4. Lewis acid character of boron trihalides is as a follows:

    (a)

    BF3 > BCl3 > BBr3 > BI3

    (b)

    BCI> BF3 > BBr3 > BI3

    (c)

    BI3 > BBr3 > BCl3 > BF3

    (d)

    BI3 > BF3 > BCl3 > BBr3

  5. Select the incorrect statement regarding B2H6.

    (a)

    It contains B-B ionic bond

    (b)

    Each boron is Sp3 hybridised

    (c)

    It has two types of hydrogen bonds

    (d)

    it is used as a reducing agent

  6. 5 x 1 = 5
  7. Potash alum

  8. (1)

    K2SO4·Cr2(SO4)3.24.H2O

  9. Sodium alum

  10. (2)

    (NH4)2SO4·AI2(SO4)3.24H2O

  11. Ammonium alum

  12. (3)

    Na2SO4·AI2(SO4)3·24H2O

  13. Chrome alum

  14. (4)

    K2SO4·Ar2(SO4)3.24.H2O

  15. Group 18

  16. (5)

    Inert gases

    5 x 2 = 10
  17. Write a short note on anamolous properties of the first element of p-block

  18. Describe briefly allotropism in p- block elements with specific reference to carbon

  19. How is boric acid extracted from borax?

  20. Explain the formation of boron trifluoride.

  21. Draw the structure of borazole B3N3H6.

  22. 5 x 3 = 15
  23. Give the uses of silicones

  24. AlCl3 behaves like a lewis acid. Substantiate this statement.

  25. Describe the structure of diborane

  26. Draw the structure of boric acid.

  27. What are the uses of boric acid?

  28. 3 x 5 = 15
  29. Write a note on zeolites.

  30. What are the various methods by which carbon-di-oxide is prepared?

  31. How are silicates classified? Give an example for each type of silicate.

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