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Transition and Inner Transition Elements Model Question Paper

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Which of the following compounds is colourless?

    (a)

    Fe3+

    (b)

    Ti4+

    (c)

    Co2+

    (d)

    Ni2+

  2. The correct order of increasing oxidizing power in the series

    (a)

    VO2+ < Cr2O72- < MnO4-

    (b)

    Cr2O72- < VO2+ < MnO4-

    (c)

    Cr2O72- < MnO4- < VO2+

    (d)

    MnO4- < Cr2O72- < VO2+

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

    (a)

    BrO3- MnO2

    (b)

    Br2, MnO42-

    (c)

    Br2, MnO2

    (d)

    BrO-, MnO42-

  4. The highest possible oxidation state shown by osmium in its compound is

    (a)

    +4

    (b)

    +6

    (c)

    +8

    (d)

    +10

  5. Which one of the following exhibits highest oxidation state?

    (a)

    Ni

    (b)

    Mn

    (c)

    V

    (d)

    Zr

  6. 5 x 2 = 10
  7. Describe the preparation of potassium dichromate.

  8. What is lanthanide contraction and what are the effects of lanthanide contraction?

  9. Why do transition metals have high enthalpy of hydration?

  10. Calculate the magnetic moment of Fe3+ ion (Atomic no. of Fe = 26)

  11. Silver atom has completely filled d-orbitals (4d10) in its ground state. How can you say that it is a transition element?

  12. 5 x 3 = 15
  13. Which is more stable? Fe3+ or Fe2+ - explain.

  14. Explain why Cr2+ is strongly reducing while Mn3+ is strongly oxidizing.

  15. Compare the ionization enthalpies of first series of the transition elements.

  16. What are the general properties of f-block elements? (Lanthanides and Actinides)
    (i) Electronic configuration
    (ii) Oxidation state
    (iii) Radii of tripositive ions.

  17. Give reason for the following:
    (i) Compounds of transition elements are generally coloured,
    (ii) MnO is basic while Mn2O7 is acidic.
    (iii) Calculate the magnetic moment of a divalent ion in aqueous medium if its atomic number is 26.

  18. 4 x 5 = 20
  19. Describe the variable oxidation state of 3d series elements.

  20. Which metal in the 3d series exhibits +1 oxidation state most frequently and why

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

  22. How are materials classified based on their magnetic properties?

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