p - Block Elements - I One Mark Questions

12th Standard EM

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 20
    10 x 1 = 10
  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. In diborane, the number of electrons that accounts for banana bonds is

    (a)

    six

    (b)

    two

    (c)

    four

    (d)

    three

  4. The element that does not show catenation among the following p-block elements is

    (a)

    Carbon

    (b)

    silicon

    (c)

    Lead

    (d)

    germanium

  5. Carbon atoms in fullerene with formula C60 have

    (a)

    sp3 hybridised

    (b)

    sp hybridised

    (c)

    sp2 hybridised

    (d)

    partially sp2 and partially sp3 hybridised

  6. 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

  7. 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

  8. The stability of +1 oxidation state among Al, Ga, In and Tl increases in sequence

    (a)

    TI < In < Ga < Al

    (b)

    In < TI < Ga < Al

    (c)

    Ga < In < Al < TI

    (d)

    Al < Ga < In < TI

  9. Which one of the following compounds has similar structure to that of graphite?

    (a)

    Boron nitride

    (b)

    Boron Carbide

    (c)

    Aluminium Carbide

    (d)

    Aluminium Oxide

  10. Chemical formula of phosgene is

    (a)

    COCl2

    (b)

    CaOCl2

    (c)

    CaCO3

    (d)

    COCI

  11. 10 x 1 = 10
  12. Potash alum

  13. (1)

    Sodium salt

  14. Sodium alum

  15. (2)

    K2SO4·Ar2(SO4)3.24.H2O

  16. Ammonium alum

  17. (3)

    (NH4)2SO4·AI2(SO4)3.24H2O

  18. Chrome alum

  19. (4)

    Colourless crystal

  20. Group 18

  21. (5)

    B-H bonds

  22. Borax

  23. (6)

    Graphite

  24. Boric acid

  25. (7)

    Inert gases

  26. Diborane

  27. (8)

    Non - flammable gas

  28. Carbon

  29. (9)

    K2SO4·Cr2(SO4)3.24.H2O

  30. Carbon dioxide

  31. (10)

    Na2SO4·AI2(SO4)3·24H2O

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