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d and f-Block Elements Test - 12
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d and f-Block Elements Test - 12
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  • Question 1/10
    1 / -0

    Which one of the following is a diamagnetic ion?

    Solutions

    Co+2 = [Ar] 3d7
    Cu2+ = [Ar] 3d9
    Mn+2 = [Ar] 3d5
    Sc+3 = [Ar]
    We can see that only Sc+3  has no unpaired electron, so it is a diamagnetic ion.

  • Question 2/10
    1 / -0

    The elements which lie between s and p block elements in the long form periodic table are called as:

  • Question 3/10
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     The inner transition elements are the elements in which the added electrons go to:

    Solutions

    The inner transition elements are the elements in which the added electrons go to (n-2) f-orbitals. These include lanthanoids and actinoids. In lanthanoids, the added electron goes to 4f orbital and in actinoids, the added electron goes to 5f orbital.

  • Question 4/10
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    The second series of transition element starts with:

    Solutions

    The second series includes the elements yttrium (symbol Y, atomic number 39) to cadmium(symbol Cd, atomic number 48). 

  • Question 5/10
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    Which form of silver is colourless?

    Solutions

    ilver in the form of Ag+ is colourless. For transition metal ions to exhibit color, their metal ions must have incompletely filled (n-1)d orbitals.

    Ag+ =4d10,5s0

    Ag+ has completely filled d orbitals hence is colourless.

  • Question 6/10
    1 / -0

     Which among the following is colourless?

    Solutions

    Zn2+ has completely filled d-orbitals and there are no vacant d-orbitals for the transition of electrons, hence it is colourless.

  • Question 7/10
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     Melting point of d block elements across a period:

    Solutions

    Till d5 unpaired electron are increasing so maximum bonding as unpaired electron take part in bonding. So melting point increases till d5 then start decreasing due to pairing which decreases metallic bond strength and thus melting point.

  • Question 8/10
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    Which of the following group of elements are not regarded as transition elements?

    Solutions

    Zn, Cd & Hg because the d-orbital of these elements are completely filled. So, they don't show the characteristics of transition elements (i.e. the d-orbital of transition elements is incomplete.

  • Question 9/10
    1 / -0

    The first ionization energy of the d-block elements are?

    Solutions

    The first ionization energy of the d-block elements are between s and p-block elements. Thus they are more electropositive than p-block elements and less electropositive than s-block elements.

  • Question 10/10
    1 / -0

    Which ion will show more paramagnetic behaviour ?

    Solutions

    Since the configuration of Fe3+ ion is (argon ) 3d5,which contains maximum number of unpaired electrons, hence more will be paramagnetic behavior.

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