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Which out of the two ,La(OH)(3) and Lu(O...

Which out of the two ,`La(OH)_(3) and Lu(OH)_(3)`, is more basic and why?

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`La(OH)_(3)` is more basic than `Lu(OH)_(3)` because the latter has greater covalent charcter as compared to the former on account of lanthanoid contraction. The release of `OH^(-)` ion from. `Lu(OH)_(3)` is more difficult and is less basic than `La(OH)_(3)`.
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(a). Of the lanthanides, cerium (Z=58) forms a tetrapositive ion, Ce^(4+) in aqueous solution. Why? (b), The +3 oxidation states of lanthanum (Z=57) , gadolinium (Z=64) and lutetium (Z=71) are especially stable. Why? (c). Why Zr and or Nb anbd Ta exhibit similar properties ? (d). Which oiut of the two La(OH)_3 and Lu(OH)_3 , is more basic and why?

Why Ce(OH)_(3) is more basic than Lu(OH)_(3) ?

Lanthanoids and actinoids are f-block elements in which the last electron enters the anti-penultimate energy level. The most common oxidation state of lanthanoids is +3, though +2 and +4 oxidation states are exhibited by some of the elements. In lanthanoid series, there is a progressive decrease in atomic and ionic radii, known as lanthanoid contraction. Unlike lanthanoids, actinoids show a large number of oxidation states. Which out of La(OH)_3 and Lu(OH)_3 is more basic?

La^(3+) and Lu^(3+) are

Among the lanthanides, La^(3+) and Lu^(3+) ions are

Explain the following : (a) Out of Sc^(3+), Co^(2+) " and "Cr^(3+) "ions, only "Sc^(3+) is colourless in aqueous solutions. (Atomic no.: Co =27, Sc = 21 and Cr =24) (b) The E^(@)Cu^(2+)//Cu for copper metal is positive (+0.34), unlike the remaining members of the first transition series. (c) La(OH)_(3) " is more basic than Lu "(OH)_(3).

Why NaOH cannot be used to separate Al(OH)_(3) and Zn(OH)_(3) ?

DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Question From Board Examination
  1. Why is +2 oxidation state of manganese quite stable while the same is ...

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  2. Write the electronic configuration of the element with atomic number 1...

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  3. Which out of the two ,La(OH)(3) and Lu(OH)(3), is more basic and why?

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  4. Why are Zn, Cd and Hg quite soft and have low melting points ?

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  5. Lanthanoid contraction is caused due to:

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  6. What may the possible oxidation state of transition metals with the fo...

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  7. Discuss the relative stability in aqueous solution of +2 oxidation sta...

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  8. How many unpaired electrons are present in Mn^(2+) ion ? How do they i...

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  9. Complete the following chemical equations for reactions in aqueous sol...

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  10. There is a greater range of variable oxidation states among the actino...

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  11. Why is ghere a general increase in density of elements from titanaium ...

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  12. Three occurs much more frequently metal-metal bonding in the compound...

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  13. Why is Cu^(+) ion not stable in aqueous solution ? or Why is Cu^(+...

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  14. Complete the following : (i) Cr(2)O(7)^(2-)(aq)+H(2)S(g)+H^(+)(aq) t...

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  15. Which is a stronger reducing agent Cr^(2+) or Fe^(2+) and why?

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  16. Among the divalent cations in the first transition series, manganese e...

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  17. La^(3+)(Z=57) and Lu^(3+)(Z=71) do not show any colour in solution. As...

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  18. Transition element act as good catalysts because

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  19. The atomic radii of the metals of the third (5d) series of transitions...

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  20. Explain why zinc is not rgardede as a transition element.

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