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La^(+3) and Lu^(+3) have their ionic rad...

`La^(+3)` and `Lu^(+3)` have their ionic radii 'a' and 'b' respectively, then lanthanide contraction will be equal to

A

b-a

B

a-b

C

`b/a`

D

`a/b`

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The correct Answer is:
B
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The f-block elements are those in which the differentiating electron enters the (n-2)f orbital. There are two series of f-block elements corresponding to filling of 4f and 5f-orbitals called lanthanides and actinides respectively. They show different oxidation states depending upon the stability of f^0, f^7 and f^14 configurations, though the principal oxidation state is +3. There is a regular decrease in size of lanthanide ions with increase in atomic number and it is known as lanthanide contraction. As a result of this, the basic character of oxides and hydroxides decreases from first element (La) to last element (Lu). All the actinides are radioactive and therefore, it is difficult to study their chemical nature. Which of the following statements is not true ?

MARVEL PUBLICATION-D AND F BLOCK ELEMENTS -TEST YOUR GRASP
  1. In inner transition elements, which f subshell gets filled up with el...

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  2. Which of the following ion of Ianthan ides is / are coloured?

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  3. La^(+3) and Lu^(+3) have their ionic radii 'a' and 'b' respectively, t...

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  4. Which lanthanide element does not occur in nature ?

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  5. For, both lanthanides and actinides, which of the following statement ...

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  6. In which of the following pairs, tripositive ions of both will have s...

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  7. Ionic radius of La^(+3) is 106 pm, ionic radius of Lu^(+3) be

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  8. The most common oxidation state of lanthanoids is

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  9. Which of the following elements belong to actinoid series?

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  10. Which element among the Ianthanoids has the smallest atomic radius ?

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  11. The properties of Zr and Hf are similar because

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  12. Which of the following statement/s is / are true?

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  13. Which of the following statement/s is / are true ?

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  14. Element with following accepted electronic configuration [Rn] 5f^7 6d^...

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  15. Lanthanide and Actinide contraction refers to

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  16. General electronic configuration of lanthanides is

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  17. Oxidation state/s exhibited by Ce is / are

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  18. Lanthanoids are

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  19. Choose the stable oxidation states of cerium (Ce).

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  20. For hydroxides of lanthanides

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