Answer :

(i) Due to lanthanide contraction, size reduces. With reduction in size, covalent character increases. Therefore, Lu2O3 is more covalent than La2O3

(ii) Oxosalts contain oxygen as anion. As the size of cation reduces from La to Lu, according to Fajan’s rules, the polarizing power of the cation will increase and it will distort the cloud of oxygen(anion) greatly, thus the bond weakens and the stability also reduces.

(iii)As the size of central atom reduces, stability of complex increases. A small metal ion with greater charge attracts the ligands better.

(iv) In 5d block elements, due to poor shielding of f orbitals, the effective nuclear charge increases, thereby reducing the size. This is called lanthanide contraction. So, the radii of 4d and 5d block elements end up being very similar.

(v) From La to Lu, the acidic character increases. As the size reduces from La to Lu, the ability to lose electrons(Lewis base character) reduces, so acidity will increase.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses

On the basis of LChemistry - Exemplar

Which of the follChemistry - Exemplar

Which of the follChemistry - Exemplar