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Transition and Inner Transition Elements 3 Mark Creative Question Paper With Answer Key

12th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 45

    3 Marks

    15 x 3 = 45
  1. What is meant by lanthanoid contraction?

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

  3. Discuss the general characteristic of the 3d series of the transition elements with special reference to their
    (i) Atomic size
    (ii) Enthalpies of atomisation

  4. Complete the following equations.
    (i) Cr2O72- + 2OH-
    (ii) MnO4- + 4H+ + 3e- ⟶

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

  6. Explain why oxidation states of transition elements increases first from Sc to Mn and then decrease?

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

  8. Account for the following:
    (i) Cobalt (II) is stable in aqueous solution but in the presence of complexing reagents, it is easily oxidised.
    (ii) The d1 configuration is very unstable in ions.

  9. 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.

  10. (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.

  11. Give reason for the following:
    (i) A transition metal exhibits highest oxidation state in oxides and fluorides.
    (ii) Cu2+ is unstable in an aqueous solution.

  12. Why are Ni(lI) compounds thermodynamically more stable than Pt(II) compounds?

  13. What are redox reactions?

  14. Complete the following reactions?
    i) Cr2 + 2e-
    ii) Mn2+ + 2e- ⟶
    iii) Fe2+ + 2e
    iv) CO2+ + 2e-

  15. Write the properties of interstitial compound.

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