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D and F Block Elements Test - 3
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D and F Block Elements Test - 3
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  • Question 1/8
    1 / -0

    Generally transition metals act as catalyst because of –

    Solutions

    Transition metals acts as a catalyst due to the free valencies; large surface area and availability of unpaired d-electron.

  • Question 2/8
    1 / -0

    Zn and Hg belong to the same group, they differ in many of their properties. The property that is shared by both is –

    Solutions

    Zn and Hg belong to same group, they different in many of their properties as the oxide readily and the react with not conc. H2SO4 
    Zn + 1/2 O2→ ZnO 
    Zn + H2SO4→ ZnSO4 + H2

  • Question 3/8
    1 / -0

    The element Z = 107 and Z = 109 have been made recently; element Z = 108 has not yet been made. Indicate the group in which you will place the above elements.

    Solutions

    The electronic configuration of these elements are: 
    Z = 107 [Rn] 5f 14 6d5 7s2 
    Z = 108 [Rn] 5f 14 6d6 7s2 
    Z = 109 [Rn] 5f 14 6d7 7s2 
    These elements will be place in d-block in groups 7th, 8th and 9th respectively.

  • Question 4/8
    1 / -0

    Identify the incorrect statement among the following:

    Solutions

    4f and 5f belongs to different energy levels, hence the shielding effect is on them is not the same. 
    Shielding of 4f is more than 5f. 
    Hence, option B is correct.

  • Question 5/8
    1 / -0

    The actinoides exhibit more number of oxidation states in general than the lanthanoids. This is because

    Solutions

    The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because the 5f orbitals extend further from the nucleus than the 4f orbitals. 
    Hence, option B is correct.

  • Question 6/8
    1 / -0

    Lanthanoid contraction is caused due to

    Solutions

    4f type of orbitals aredifused and have imperfect shielding.

  • Question 7/8
    1 / -0

    Larger number of oxidiation states are exhibited by the actinoids than those by the lanthanoids the main reason being

    Solutions

    This is because of comparatively lesser difference in the energies of 5f and 6d than 4f and 5d orbitals.

  • Question 8/8
    1 / -0

    Which of the following group of transition metals is called coinage metals?

    Solutions

    Cu, Ag, Au group of elements are called coinage metals as these are used in minting coins. 
    Hence, option A is correct.

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