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Which of the following factor may be reg...

Which of the following factor may be regarded as the main cause of lanthanide contration ?

A

Poor shielding of one of the 4f electrons .

B

Effective shielding of one of the 4f electrons by another in the sub shell

C

Poor shielding of 5d electron by 4f electrons

D

Greater shielding of 5d electrons by 4f electrons.

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Knowledge Check

  • The main cause of lanthanide-contraction is

    A
    poor shielding of one of the 4f -eIectrons by another in the subshell
    B
    greater shielding of 5d electrons by 4f electrons
    C
    poorer shielding of 5d electrons by 4f electrons
    D
    effective shielding of one of the 4f electrons by another in the subshell

  • Which of the following is a lanthanide ?

    A
    Ta
    B
    Rh
    C
    Th
    D
    Lu

  • Which of the following statements regarding copper salte is not true :

    A
    Copprer (I) disproportionates into Cu and Cu (II) in aqueous solution
    B
    Copper (I) can be stabilised by the formation of insoluble complex compound such as `CuCl_2^-` and `Cu(CN)_2^-`
    C
    Copper (II) oxide is red powder
    D
    Hydratd `CuSO_4` is `[Cu(H_2O)_4]SO_4H_2O`
    • SHARAM PUBLICATION-D AND F BLOCK ELEMENTS-EXERCISE
    1. Which of the following factor may be regarded as the main cause of lan...

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    2. Which element does not show variable oxidation state ?

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    3. Which of the following oxidation state-is the most common among the la...

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    4. In the first transition series which of the following has lowest entha...

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    5. Which of the following is not a transition element ?

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    6. Formation of intertitial compounds make the transition metal :

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    7. Which of the following ion is colourless in aqueous solution ?

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    8. Which of the following statement about transition elements is correct ...

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    9. Permanent magnets are generaly made of alloys of :

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    10. In which of the following pairs, both the ions are coloured in aqueous...

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    11. The main reason for the large number of oxidation states exhibited by ...

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    12. Among the following out electronic configuration of atoms the highest ...

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    13. A reduction in atomic size with increase in atomic number is a charact...

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    14. The magnetic character of transition elements of its ion is due to

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    15. Which of the following transition metals show the maximum oxidation st...

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    16. Among the following series of transition metal ions the one where all ...

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    17. Which of the following d- block elements has half filled penultimate d...

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    18. The catalyst used for olefin polymerisation is

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    19. The malleability and ductility of metals can be accounted due to

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    20. Write down the electronic configuration of gadolinium (Gd). Its atom...

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