Home
Class 12
CHEMISTRY
On the basis of lanthanoid contraction, ...

On the basis of lanthanoid contraction, explain the following:
(i) Nature of bonding in `La_(2)O_(3)` and `Lu_(2)O_(3)`.
(ii) Trends in the stability of oxo salts of lanthanoids from La to Lu.
(iii) Stability of the complexes of lanthanoids.
(iv) Radii of 4d and 5d block elements.
(v) Trends in acidic character of lanthanoids oxides.

Text Solution

Verified by Experts

(i) As the size decreases from La to Lu,covalent character increases ( according to Fajan's rule). Hence, `La_(2)O_(3)` is more ionic and `Lu_(2)O_(3)` is more covalent.
(ii) As the size decreasesfrom La to Lu, stability of oxo salts decreases.
(iii) As the size of lanthanoid decreases, charge `//`sizeratio increases andhence the stability of the complecxes increases.
(iv) Due to lanthanoid contraction, radii of 4d and 5d block elements are nearly equal.
(v) As explained in (i), covalend character of oxides increases from La to Lu, therefore, their basic character decreases or acidic character increases.
Promotional Banner

Topper's Solved these Questions

  • D- AND F-BLOCK ELEMENTS

    PRADEEP|Exercise ADDITIONAL QUESTIONS (VERY SHORT ANSWER QUESTIONS)|49 Videos

  • D- AND F-BLOCK ELEMENTS

    PRADEEP|Exercise ADDITIONAL QUESTIONS (SHORT ANSWER QUESTIONS )|34 Videos

  • D- AND F-BLOCK ELEMENTS

    PRADEEP|Exercise ASSERTION AND REASON TYPE QUESTIONS|5 Videos

  • CORDINATION COMPOUNDS

    PRADEEP|Exercise Important Questions|28 Videos

  • ELECTROCHEMISTRY

    PRADEEP|Exercise IMPORTANT QUESTIONS FOR BOARD EXAMINATION|25 Videos

Similar Questions

Explore conceptually related problems

What is the nature of the following oxides : (i) CO (ii) Al_(2)O_(3) (iii) CO_(2) (iv) CaO (v) SO_(3) ?

Select the acidic and basic anhydrides from the following : (i) Na_(2)O (ii) P_(4)O_(6) (iii) SO_(2) (iv) Al_(2)O_(3)

Arrange the following in correct order of acidity (I) CaO , (II) SO_(2) , (III) SO_(3) , (IV) P_(2)O_(5)

What is lanthanoid contraction? (b) Write any one use of lathanoid (c) \(La(OH)_{2}\) is more basic than \(Lu(OH)_{3}\) .Explain.

Consider the following statement in respect of Lantinanoids : (i) The basic strength of hydroxides of lanthanoids increases from La (OH)_(3) to Lu (OH)_(3) . (ii) The lanthanoid ions Lu^(3+), Yb^(2+) and Ce^(4+) are diamagnetic. Which of the statements (s) given above is /are correct ?

Discuss the trend of the following (i) Thermal stability of carbonates of Group 2 elements. (ii) The solubility and the nature of oxides of Group 2 elements.

Which of the following oxides are amphoteric? (i) Tl_(2)O (ii) Al_(2)O_(3) (iii) Ga_(2)O_(3) (iv) In_(2)O_(3)

A: La(OH)_(3) , is less basic than Lu(OH)_(3) , R: Basic character of hydroxides of lanthanoids increase on moving from La^(+3) to Lu^(+3)

Arrange the following oxides in decreasing acidic order SiO_(2) (I) CO_(2) (II) SO_(3) (III) N_(2)O_(5) (IV)