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d and f-Block Elements Test - 6
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d and f-Block Elements Test - 6
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  • Question 1/7
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    Which of the following is not a coinage metal?

    Solutions

    The elements in the group 11, of the modern periodic table, consisting of copper, silver, and gold are referred to as coinage metals. Roentgenium placed in this group in the periodic table, although it is yet to be confirmed that it behaves like the heavier homologue to gold.

    Coinage metals are usually alloys designed to resist corrosion and wear during a thirty to forty year lifespan. Aluminum, nickel, copper, bronze, gold, tin, and silver are some of the metals that have been used for this purpose.

    Platinum, however is not a coinage metal.

     

  • Question 2/7
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    Which of the following statements is incorrect?

    Solutions

    All the elements of the lanthanide series resemble each other very closely due to the similarity in the configuration of the outermost and the penultimate shells. They are also called rare earth elements. 4f and 5f belong to different energy levels. Hence, shielding effects in them are not the same. Shielding of 4f is more than that of 5f.

     

  • Question 3/7
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    The highest oxidation state of Cr is

    Solutions

    The electronic configuration of Cr is (3d)5 (4s)1. Thus, it will have +6 as its highest oxidation state.

     

  • Question 4/7
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    For Cr, the states +2, +3 +4 and +1 are well known, but the most stable state among these is

    Solutions

    In this state, chromium is neither oxidising nor reducing and is believed to be its most stable state.
    This is because in +3 oxidation state, chromium has the stable configuration of half-filled t2g orbitals [t2g3 eg0].

     

  • Question 5/7
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    Transition metal compounds are usually coloured. This is due to the electronic transitions

    Solutions

    Transition metal compounds are usually coloured. This is due to the electronic transitions within d-orbitals.

     

  • Question 6/7
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    Directions For Questions

    The following question has four choices, out of which ONLY ONE is correct.

    ...view full instructions

    Which of the following compounds is coloured?

    Solutions

    In transition series, colour appears due to d-d transition in the visible region. Cr3+ has d3 configuration. So, d-d transition is possible. Hence, the compound will be coloured.

     

  • Question 7/7
    1 / -0

    The number of unpaired electrons in Mn2+ (25) is

    Solutions

    The electronic configuration of Mn2+ (25) is 3d5 4s0.
    This is a stable configuration of half-filled d-orbitals.

     

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