Q67Multiple choice
On the basis of Lanthanoid contraction, explain the following :
- (i)Nature of bonding in La2O3 and Lu2O3.
- (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 lanthanoid oxides.
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Hint : (i) As the size decreases covalent character increases. Therefore La2O3 is more ionic and Lu2O3 is more covalent. (ii) As the size decreases from La to Lu, stability of oxosalts also decreases. (iii) Stability of complexes increases as the size of lanthanoids decreases. (iv) Radii of 4d and 5d block elements will be almost same. (v) Acidic character of oxides increases from La to Lu.