p - Block Elements - II Model Question Paper

12th Standard EM

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Chemistry

Time : 02:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. In which of the following , NH3 is not used?

    (a)

    Nessler’s reagent

    (b)

    Reagent for the analysis of IV group basic radical

    (c)

    Reagent for the analysis of III group basic radical

    (d)

    Tollen’s reagent

  2. The molarity of given orthophosphoric acid solution is 2M. its normality is

    (a)

    6N

    (b)

    4N

    (c)

    2N

    (d)

    none of these

  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. On oxidation with iodine, sulphite ion is transformed to

    (a)

    S4O62-

    (b)

    S2O62-

    (c)

    SO42-

    (d)

    SO32-

  5. When copper is heated with conc HNO3 it produces

    (a)

    Cu(NO3)2 , NO and NO2

    (b)

    Cu(NO3)2 and N2O

    (c)

    Cu(NO3)2 and NO2

    (d)

    Cu(NO3)2 and NO

  6. 5 x 1 = 5
  7. XeF6

  8. (1)

    Greenish yellow gas

  9. Chlorine

  10. (2)

    Volcanic eruptions

  11. Sulphur dioxide

  12. (3)

  13. Sodium nitrate

  14. (4)

    Distorted Octahedral

  15. Pyrophosphoric acid

  16. (5)

    Chile saltpetre

    3 x 1 = 3
  17. Which of the following is correct?
    a) In PF5 axial and equatorial bonds are interchanged known as pseudo rotation
    b) In solid state PF5 remains covalent
    c) PH5 cannot be obtained - because H is not sufficiently electronegative to make the d-orbitals contact sufficiently
    d) All the above

    ()

    All the above

  18. About" Ammonia"
    I. Ammonia is formed by the hydrolysis of urea.
    II. It is heavier than air.
    III. It can readily liquefied by at about atmospheric pressure.
    IV. Liquid ammonia resembles water in its physical properties.
    a) I, III and IV only
    b) II, I, III and IV
    c) II, I, IV and III
    d) I, II, III and IV

    ()

    I, III and IV only

  19. I. Nitric acid is used in the preparation of aquaregia.
    II. Salts of nitric acid are used in photography.
    III. About 50% of earth atmosphere contains dinitrogen gas.
    IV. CO2 is the principle gas of atmosphere.
    a) I and II only
    b) III and IV only
    c) III, II, IV and I
    d) I, II, III and IV

    ()

    I and II only

  20. 5 x 2 = 10
  21. What is inert pair effect?

  22. Explain why fluorine always exhibit an oxidation state of -1?

  23. What are interhalogen compounds? Give examples.

  24. Give the uses of helium.

  25. Give two uses of nitric acid

  26. 4 x 3 = 12
  27. Give the balanced equation for the reaction between chlorine with cold NaOh and hot NaOH.

  28. Give the uses of sulphuric acid.

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

  30. Give the uses of argon.

  31. 3 x 5 = 15
  32. Give two equations to illustrate the chemical behaviour of phosphine.

  33. What happens when PCl5 is heated?

  34. What type of hybridisation occur in
    a) BrF5
    b) BrF3

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