Transition and Inner Transition Elements Model Question Paper

12th Standard EM

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Chemistry

Time : 02:00:00 Hrs
Total Marks : 50
    10 x 1 = 10
  1. Sc( Z=21) is a transition element but Zinc (z=30) is not becaus

    (a)

    both Sc3+ and Zn2+ ions are colourless and form white compounds

    (b)

    in case of Sc, 3d orbital are partially filled but in Zn these are completely filled

    (c)

    last electron as assumed to be added to 4s level in case of zinc

    (d)

    both Sc and Zn do not exhibit variable oxidation states

  2. the catalytic behaviour of transition metals and their compounds is ascribed mainly due to

    (a)

    their magnetic behaviour

    (b)

    their unfilled d orbitals

    (c)

    their ability to adopt variable oxidation states

    (d)

    their chemical reactivity

  3. The alloy of copper that contain Zinc is

    (a)

    Monel metal

    (b)

    Bronze

    (c)

    bell metal

    (d)

    brass

  4. Permanganate ion changes to ________ in acidic medium

    (a)

    MnO42−

    (b)

    Mn2+

    (c)

    Mn3+

    (d)

    MnO2

  5. MnO4- react with Br- in alkaline PH to give

    (a)

    BrO3- MnO2

    (b)

    Br2, MnO42-

    (c)

    Br2, MnO2

    (d)

    BrO-, MnO42-

  6. The number of moles of acidified KMnO4 required to oxidize 1 mole of ferrous oxalate(FeC2O4) is

    (a)

    5

    (b)

    3

    (c)

    0.6

    (d)

    1.5

  7. Which of the following lanthanoid ions is diamagnetic?

    (a)

    Eu2+

    (b)

    Yb2+

    (c)

    Ce2+

    (d)

    Sm2+

  8. Which of the following oxidation states is most common among the lanthanoids?

    (a)

    4

    (b)

    2

    (c)

    5

    (d)

    3

  9. Identify the paramagnetic species

    (a)

    Cu+

    (b)

    Cr+

    (c)

    MnO4

    (d)

    Zn2+

  10. Which of the following is coloured due to charge transfer?

    (a)

    MnO4-

    (b)

    CrO42-

    (c)

    Cu2O

    (d)

    All of these

  11. 5 x 1 = 5
  12. CeO2 & ThO2

  13. (1)

    Rare earth elements

  14. Pu-238

  15. (2)

    Artificial joint

  16. Zr and Hf

  17. (3)

    Long mission space probes

  18. f - block elements

  19. (4)

    Similar size

  20. Titanium

  21. (5)

    Gas lamp materials

    5 x 2 = 10
  22. What are transition metals? Give four examples.

  23. What are inner transition elements?

  24. What are actinides? Give three example

  25. Describe the preparation of potassium dichromate.

  26. What are coinage metals?

  27. 5 x 3 = 15
  28. What are interstitial compounds?

  29. Write the electronic configuration of Ce4+ and Co2+.

  30. Compare lanthanides and actinides

  31. Actinoid contraction is greater from element to element than the lanthanoid contraction, why?

  32. Write chemical equations for the reactions involved in the manufacture of potassium permanganate from pyrolusite ore.

  33. 2 x 5 = 10
  34. Which is stronger reducing agent Cr2+ or Fe2+?

  35. Why first ionization enthalpy of chromium is lower than that of zinc?

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