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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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The correct Answer is:
`La(OH)_(3)` is more basic than `Lu(OH)_(3)` , As the size of the lanthanoid ion decrease from `La^(3+) to Lu^(3+)` the ionization energy increases and therefore metallic character decrease. Hence , the basic strength decreases from `La(OH)_(3)` to `Lu(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) ?

RESONANCE-D BLOCK ELEMENTS-EXERCISE-2 PART-I
  1. Why is the E^(Theta) value for the Mn^(3+)//Mn^(2+) couple much postiv...

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

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

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  4. The aqueous solution of FeCl(3) is acidic . Why?

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  5. Ferric iodide is very unstable but ferric chloride is not

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  6. Copper dissolves in dilute nitrate acid but not in dilute HCl. Why?

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  7. Blue colour of CUSO(4) solution is discharge slowly when an iron rod i...

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  8. Copper (I) Salts are not known in aueous solution.

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  9. Calculate the number of unpaired electrons in the following gaseous io...

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  10. Mercurous ion is written as Hg(2)^(2+) whereas cuprous ion is written ...

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  11. Copper sulphate dissolves in Nh(4)OH solution but FesO(4) does not.

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  12. An aqueous solution of inorganic compounds (X) gives following reactio...

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  13. H(2)S gas is passed through an acidic solution of K(2)Cr(2)O(7) . The ...

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  14. What happen when(i) a small amount of Kmno(4) is added to concentrated...

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  15. A hydrated mettalic salt(A). Light green in colour , on careful heatin...

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  16. A white substance (A) reacts with dilute H(2)SO(4) to produce a colour...

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  17. Write the balanced chemical equation for the following reaction:- Nitr...

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  18. Complete and //balance the following equation: Ag(2)S+CuCl(2)+Hg…………...

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

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  20. One among the lanthanoides, Ce(III), can be easily oxidized to Ce(IV) ...

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