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d and f-Block Elements Test - 11
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d and f-Block Elements Test - 11
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  • Question 1/9
    1 / -0

    The characteristic that does not contribute to catalytic activities of transition elements is

    Solutions

    The tendency of transition elements to exhibit variable oxidation states enables them to form intermediates with lower ionization energies.

     

  • Question 2/9
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    All of the following are interstitial compounds of transition elements, except

    Solutions

    Oxides of transition elements are ionic compounds.

     

  • Question 3/9
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    Which of the following statements about interstitial compounds is incorrect?

    Solutions

    The electrical conductivity of transition elements is retained in interstitial compounds.

     

  • Question 4/9
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    The element that does not form an amalgam is

    Solutions

    Iron does not reduce readily and hence, mercury cannot diffuse into iron lattice to form amalgam.

     

  • Question 5/9
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    Elements like Fe, Co and Ni acquire permanent magnetic moment when placed in a magnetic field. The property is referred to as

    Solutions

    The domains of the unpaired electrons get aligned along the same direction to make the substance strongly magnetic.

     

  • Question 6/9
    1 / -0

    The oxidising action of KMnO4 is strongest in the acidic medium. Which of the following acids is/are not suitable for creating the acidic medium?

    Solutions

    Chloride ion undergoes oxidation to produce chlorine gas and thus, interferes with the results. HNO3 is itself a strong oxidising agent and will also interfere with the results.

     

  • Question 7/9
    1 / -0

    The green-coloured compound formed when manganese dioxide is fused with KOH is

    Solutions

    2MnO2 + 4KOH + O2 → 2K2MnO4 + 2H2O

     

  • Question 8/9
    1 / -0

    The group of elements with abnormally low values of IE3 is

    Solutions

    Loss of 3 electrons enables these elements to acquire the stable electronic configuration of empty, half-filled and fully-filled 4f orbitals.

     

  • Question 9/9
    1 / -0

    Which of the following statements is incorrect?

    Solutions

    Bk: [Rn] 5f9 6d0 7s2
    Berkelium (atomic number = 97) shows an exceptional configuration of 5f-orbital, i.e. it is neither completely filled nor half-filled.

     

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