The correct increasing order of basic charact | vedclass

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Question

(C) Due to lanthanide contraction,the ionic radius of lanthanide ions $(Ln^{3+})$ decreases as the atomic number increases from $Ce$ $(Z=58)$ to $Gd$

Vedclass · Accepted Answer

$Gd(OH)_3 < Nd(OH)_3 < Ce(OH)_3$

Vedclass · Answer

(C) Due to lanthanide contraction,the ionic radius of lanthanide ions $(Ln^{3+})$ decreases as the atomic number increases from $Ce$ $(Z=58)$ to $Gd$ $(Z=64)$.As the size of the $Ln^{3+}$ ion decreases,the covalent character of the $Ln-OH$ bond increases according to Fajan's rule.Consequently,the basic strength of the hydroxides decreases as we move from $Ce(OH)_3$ to $Gd(OH)_3$.Therefore,the correct increasing order of basic character is $Gd(OH)_3 < Nd(OH)_3 < Ce(OH)_3$.

The correct increasing order of basic character of $Ce(OH)_3$,$Gd(OH)_3$ and $Nd(OH)_3$ is

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