Transition and Inner Transition Elements Important Questions

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Which one of the following ions has the same number of unpaired electrons as present in V3+?

    (a)

    Ti3+

    (b)

    Fe3+

    (c)

    Ni2+

    (d)

    Cr3+

  2. The magnetic moment of Mn2+ ion is

    (a)

    5.92BM

    (b)

    2.80BM

    (c)

    8.95BM

    (d)

    3.90BM

  3. Which of the following compounds is colourless?

    (a)

    Fe3+

    (b)

    Ti4+

    (c)

    Co2+

    (d)

    Ni2+

  4. Which of the following is wrong with respect to lanthanide contraction?

    (a)

    Decrease in ionic radii

    (b)

    Increase in tendency to act as reducing agents

    (c)

    Decrease in basic character

    (d)

    Resembles second and third row of d-block elements

  5. Hybridisation of chromium ions and dichromate ions is

    (a)

    Sp2

    (b)

    Sp3d

    (c)

    both (a) and (b)

    (d)

    None of these

  6. 5 x 1 = 5
  7. Radioactive

  8. (1)

    Lanthanido-therrnic process

  9. Oxocations

  10. (2)

    Similar size

  11. Zr and Hf

  12. (3)

    Actinides

  13. Lanthanide

  14. (4)

    Promethium

  15. Metallotherrnic

  16. (5)

    Monazite sand

    5 x 2 = 10
  17. Why Gd3+ is colourles?

  18. Explain why compounds of Cu2+ are coloured but those of Zn2+ are colourless.

  19. Which is the most common oxidation state of lanthanoides?

  20. Write the outer electronic configuration of Cr atom (Z=24).

  21. Why is Ce4+ in aqueous solution is a good oxidising agent?

  22. 5 x 3 = 15
  23. Explain the variation in E0M3+/M2+  3d series.

  24. Compare lanthanides and actinides

  25. What is meant by lanthanoid contraction?

  26. Give reasons for the following
    (i) Mn3+ is a good oxidising agent.

  27. (i) Name the transition metal
    (a) Which is used in the manufacture of sulphuric add.
    (b) That is used in Haber's process.
    (c) That have light sensitive properties and act as valuable source in photo graphic industry.
    (ii) Write the equations which are involved in the oxidation of hydrogen sulphide to sulphur by KMnO4 solution.

  28. 3 x 5 = 15
  29. Transition metals show high melting points why?

  30. Write a note on the ionization enthalpy of transition elements.

  31. Write a short note on the oxidation states of 3d series elements.

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