Term 1 Model Question Paper

12th Standard EM

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Chemistry

Time : 02:00:00 Hrs
Total Marks : 60
    8 x 1 = 8
  1. Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

    (a)

    CO2

    (b)

    So3

    (c)

    SO2

    (d)

    H2S

  2. Cupellation is a process used for the refining of

    (a)

    Silver

    (b)

    Lead

    (c)

    Copper

    (d)

    iron

  3. Oxidation state of carbon in its hydrides

    (a)

    +4

    (b)

    -4

    (c)

    +3

    (d)

    +2

  4. Which of these is not a monomer for a high molecular mass silicone polymer?

    (a)

    Me3SiCl

    (b)

    PhSiCl3

    (c)

    MeSiCl3

    (d)

    Me2SiCl2

  5. Among the following, which is the strongest oxidizing agent?

    (a)

    Cl2

    (b)

    F2

    (c)

    Br2

    (d)

    l2

  6. Among the following the correct order of acidity is

    (a)

    HClO2 < HClO < HClO3 < HClO4

    (b)

    HClO4 < HClO2 < HClO < HClO3

    (c)

    HClO3 < HClO4 < HClO2 < HClO

    (d)

    HClO < HClO2 < HClO3 < HClO4

  7. The most common oxidation state of actinoids is

    (a)

    +2

    (b)

    +3

    (c)

    +4

    (d)

    +6

  8. Solid CO2 is an example of

    (a)

    Covalent solid

    (b)

    metallic solid

    (c)

    molecular solid

    (d)

    ionic solid

  9. 5 x 1 = 5
  10. Electro magnetic separation

  11. (1)

    Sodium salt

  12. Borax

  13. (2)

    Nuclear power plant

  14. SCN-

  15. (3)

    Tinstone

  16. U - 235

  17. (4)

    m.pt 1814 k

  18. Scandium

  19. (5)

    arnbidentatie

    6 x 2 = 12
  20. What is the difference between minerals and ores?

  21. Give the uses of Borax

  22. Give the oxidation state of halogen in the following.
    a) OF2
    b) O2F2
    c) Cl2O3
    d) I2O4

  23. Arrange the following in order of increasing molar conductivity
    (i) Mg[Cr(NH3)(Cl)5]
    (ii) Cr(NH3)5Cl]3[CoF6]2
    (iii) [Cr(NH3)3Cl3]

  24. Give any three characteristics of ionic crystals.

  25. Explain the rate determining step with an example.

  26. 5 x 3 = 15
  27. Give the uses of zinc.

  28. Give the uses of argon.

  29. Compare lanthanides and actinides

  30. Why ionic crystals are hard and brittle?

  31. (i) A first order reaction takes 8 hours for 90% completion. Calculate the time required for 80% completion. (log 5 = 0.6989 ; log10 = 1)

  32. 4 x 5 = 20
  33. Explain the principle of electrolytic refining with an example.

  34. CO is a reducing agent . justify with an example.

  35. Which is stronger reducing agent Cr2+ or Fe2+?

  36. How do nature of the reactant influence rate of reaction.

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