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Which of the following factors may be re...

Which of the following factors may be regarded as the main cause of lanthanide contraction?

A

Greater shielding of `5d` electrons by `4f` electrons

B

Poorer shielding of `5d` electron by `4f` electrons

C

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

D

Poor shielding of one `4f` electrons by another in the sub -shell.

Text Solution

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The correct Answer is:
4
Lanthanide contraction is due to poor shielding of one of `4 f` enectron by another in the sub-shell.
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RESONANCE-D BLOCK ELEMENTS-EXERCISE-3 PART-II
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  2. The number of d-electrons retained in Fe^(2+) (At. No. Fe=26) ions are...

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  3. Ammonia form the complex ion[Cu(NH(3))(4)]^(2+) with copper ions in t...

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  4. The radius of La^(3+)(Z=57) is 106 pm. Which one of the following give...

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  5. Cerium (Z= 58) is an important nember of the lanthanoids . Which of th...

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  6. The lanthanide contraction is responsible for the fact that

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  7. Which of the following factors may be regarded as the main cause of la...

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  8. The spin-only magnetic moment [in units of Bohr magneton, (mu(B) of Ni...

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  9. Lanthanoid contraction is caused due to:

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  10. Identify the incorrect statement among the following.

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  11. The actinoids exhibit more number of oxidation states in general than ...

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  12. Larger number of oxidation state are exhibited by the actinoids than t...

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  13. In context with the transition element, which of the following stateme...

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  14. Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 ...

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  15. The correct order of E(M^(2+)//M)^(@) Values with negative sign for th...

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  16. In context of the lanthanoids , which of the following statement is no...

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  17. The outer electrons configuration of Lu (Atomic No.,71) is :

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  18. Iron exhibits +2 and +3 oxidation states. Which of the following state...

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  19. Which one of the following arrangements does not represent the correct...

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  20. Four successive members of first row transition element are listed bel...

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