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d and f-Block Elements Test - 10
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d and f-Block Elements Test - 10
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  • Question 1/9
    1 / -0

    Which of the following species has the metal in zero oxidation state?

    Solutions

    In metal carbonyls, the central metal atom is in zero oxidation state.

     

  • Question 2/9
    1 / -0

    Which of the following pairs of elements exhibits only one oxidation state?

    Solutions

    Zn2+ has stable 3d10, 4s0 configuration and Sc3+ has a stable configuration of Ar. Hence, they form compounds in these oxidation states.

     

  • Question 3/9
    1 / -0

    The reduction potential of Cr3+ is -0.41 V and that of Mn3+ is +1.51 V. Which of the following can be inferred from the given factual information?

    Solutions

    Mn2+ has a stable configuration of half-filled d-orbitals and therefore Mn3+ is readily reduced to Mn2+.
    Hence, the option (2) is correct because Mn+3 is a good oxidising agent.
    This is also evident from the high value of the reduction potential.
    The other options are incorect.
    Cr+3 has a stable configuration due to half filled t2g orbitals and is more stable than Cr+2.
    Hence, Cr+2 can be easily oxidised to Cr+3 and it is a good reducing agent.

     

  • Question 4/9
    1 / -0

    Which of the following groups of elements is studied as a triad?

    Solutions

    The elements of groups 8, 9 and 10 resemble horizontally in their properties and are studied together as triads.

     

  • Question 5/9
    1 / -0

    Coinage metals belong to

    Solutions

    Copper, silver and gold are known as coinage metals because they were used to make coins. All these metals are chemically less reactive and are referred to as noble metals. They belong to group 11 of the periodic table.

     

  • Question 6/9
    1 / -0

    Mercury is the only transition element that is liquid at room temperature. Which of the following is not the reason for the same?

    Solutions

    Mercury has a high value of ionization energy because of fully-filled orbitals, and the electrons are less delocalized, which weakens the metallic bond.

     

  • Question 7/9
    1 / -0

    Anhydrous salts of CuSO4, FeSO4 and CuF2 are white because

    Solutions

    The ligand causes d-d splitting and the salt appears coloured due to d-d transitions of the electrons.

     

  • Question 8/9
    1 / -0

    The coloured cation among the following is

    Solutions

    Only V4+ has one d electron and will show d-d transition.
    Sc3+ has empty d-orbitals.
    Cu+ and Zn2+ have fully-filled d-orbitals.

     

  • Question 9/9
    1 / -0

    Transition elements possess good adsorbing qualities because of

    Solutions

    This property allows the adsorption of reactant molecules on their surfaces. Hence, they act as catalysts.

     

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