The D And F Block Elements

15 Questions | Total Attempts: 953

SettingsSettingsSettings
Please wait...
The D And F Block Elements

Time: 30 Minute


Questions and Answers
  • 1. 
    Which of the following oxidation state is common for all lanthanoids?
    • A. 

      + 2

    • B. 

      + 3

    • C. 

      + 4

    • D. 

      + 5

  • 2. 
    Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which of the following is not the characteristic property of interstitial compounds?
    • A. 

      They have high melting points in comparison to pure metals

    • B. 

      They are very hard

    • C. 

      They retain metallic conductivity

    • D. 

      They are chemically very reactive

  • 3. 
    When acidified K2Cr2O7 solution is added to Sn2+ salts, then Sn2+ changes to:
    • A. 

      Sn

    • B. 

      Sn3+

    • C. 

      Sn4+v

    • D. 

      Sn+

  • 4. 
    Metallic radii of some transition elements are given below. Which of these elements will have highest density?   
    • A. 

      Fe

    • B. 

      Ni

    • C. 

      Co

    • D. 

      Cu

  • 5. 
    A student accidently added conc. H2SO4 to potassium permagnate and it exploded due to the formation of an explosive which is:
    • A. 

      MnO

    • B. 

      Mn2O3

    • C. 

      Mn2O5

    • D. 

      Mn2O7

  • 6. 
    KMnO4 acts an oxidizing agent in alkaline medium. When alkaline KMnO4 is treated with KI, iodide ion is oxidesed to:
    • A. 
    • B. 
    • C. 
    • D. 
  • 7. 
    A transition metal exists in its highest oxidation state. It is expected to behave as:
    • A. 

      A chelating agent

    • B. 

      A central metal in a coordination compound

    • C. 

      An oxidizing agent

    • D. 

      A reducing agent

  • 8. 
    For successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order?
    • A. 

      Cr > Mn > Co > Fe

    • B. 

      Mn > Fe > Cr > Co

    • C. 

      Fe > Mn > Co > Cr

    • D. 

      Co > Mn > Fe > Cr

  • 9. 
    The colour of light absorbed by an aqueous solution of CuSO4 is
    • A. 

      Orange-red

    • B. 

      Blue-green

    • C. 

      Yellow

    • D. 

      Violet

  • 10. 
    When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to the formation of:
    • A. 
    • B. 
    • C. 
    • D. 
  • 11. 
    Lanthanoid contraction is observed in:
    • A. 

      Gd

    • B. 

      At

    • C. 

      Xe

    • D. 

      Ac

  • 12. 
    Ammonium dichromate is used in fireworks. The green coloured powder blown in the air is:
    • A. 

      CrO3

    • B. 

      Cr2O3

    • C. 

      Cr

    • D. 

      CrO (O2

  • 13. 
    Which of the following lanthanoid ion is paramagnetic?
    • A. 

      Ce4+

    • B. 

      Option 2Yb2+

    • C. 

      Lu3+

    • D. 

      4Eu2+

  • 14. 
    All Cu (II) halidesknown except iodide. The reason for this is that:
    • A. 

      Iodide ion is a bulky ion

    • B. 

      Cu2+ oxidizes iodide to iodine

    • C. 

      Cu2+ (aq.) has much more negative hydration enthalpy

    • D. 

      Cu2+ ion has smaller size

  • 15. 
    The actinoid exhibit more number of oxidation states in general than the lanthanoids. This is because:
    • A. 

      The 5f orbitals extend farther from the nucleus than the 4f orbitals

    • B. 

      The 5f orbitals are more buried than the 4f orbitals

    • C. 

      There is a similarity between the 4f and 5f orbitals in their angular part of the wave function

    • D. 

      The actinoids are more reactive than the lanthanoids

Back to Top Back to top