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d and f-Block Elements Test - 7
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d and f-Block Elements Test - 7
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  • Question 1/10
    1 / -0

    The species with the largest and smallest radii among the 3d series are respectively

    Solutions

    In transition elements, the atomic radius first decreases on moving across the period due to increase in the effective nuclear charge, remains steady towards the middle as the increase in the effective nuclear charge is balanced by the increase in repulsive forces due pairing and further increases as the electronic repulsions dominate.

    Sc – 144 pm
    Co – 116 pm

     

  • Question 2/10
    1 / -0

    Which among the following species has a radius greater than that of Fe3+?

    Solutions

    For the same element, the ion in the higher oxidation state has a smaller radius.

     

  • Question 3/10
    1 / -0

    Cu+ ion is not stable in aqueous solutions and it invariably exists as Cu2+ in them because

    Solutions

    The high value of hydration for Cu2+ compensates for high ionisation energy.

     

  • Question 4/10
    1 / -0

    In which of the following species is manganese in the lowest oxidation state?

    Solutions

    Transition elements show higher oxidation states in their oxides than in their fluorides as fluorine can form only single bonds, but oxygen can form double bonds.

     

  • Question 5/10
    1 / -0

    To which of the following categories will the given reaction belong?

    2Cu+ → Cu + Cu2+

    Solutions

    Copper is getting oxidised as well as reduced.

     

  • Question 6/10
    1 / -0

    Which of the following pairs of elements exhibits the stable configuration of half-filled 4f-orbitals?

    Solutions

    Eu: [Xe] 4f7 5d0 6s2
    Gd: [Xe] 4f7 5d1 6s2

     

  • Question 7/10
    1 / -0

    Which of the following statements is incorrect?

    Solutions

    Eu2+ and Yb2+ are good reducing agents because of their tendencies to get oxidised to their more common oxidation state (+3).

     

  • Question 8/10
    1 / -0

    Compounds of most lanthanoids occur in +3 oxidation state. Which of the following formulae of the compounds of lanthanoids is incorrect?

    Solutions

    The correct formula is LnN.

     

  • Question 9/10
    1 / -0

    Which of the following pairs represents good reducing and oxidising agents, respectively?

    Solutions

    Tb4+ has a stable configuration of half-filled 4f orbitals, but can get reduced to its more common +3 oxidation state. Eu2+ has a stable configuration of half-filled 4f orbitals, but can get oxidised to its more stable +3 oxidation state.

     

  • Question 10/10
    1 / -0

    Which of the following statements is incorrect?

    Solutions

    Lanthanoids are less basic than actinoids because they have a greater percentage of covalent character.

     

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