In the lanthanoid series,the basicity of lant | vedclass

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(B) As we move across the lanthanoid series from $La$ to $Lu$,the ionic radius of the $Ln^{3+}$ ions decreases due to lanthanoid contraction.According

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Decreases.

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(B) As we move across the lanthanoid series from $La$ to $Lu$,the ionic radius of the $Ln^{3+}$ ions decreases due to lanthanoid contraction.According to Fajan's rule,as the ionic radius decreases,the covalent character of the $Ln-OH$ bond increases.Due to the increase in covalent character,the tendency to release $OH^-$ ions decreases.Therefore,the basicity of lanthanoid hydroxides decreases from $La(OH)_3$ to $Lu(OH)_3$.

List-$I$ (Property)	List-$II$ (Element)
$(A)$ Lanthanoid showing $+4$ oxidation state	$(i)$ $Pm$
$(B)$ Lanthanoid showing $+2$ oxidation state	$(ii)$ $Ce$
$(C)$ Radioactive lanthanoid	$(iii)$ $Lu$
$(D)$ Lanthanoid with $4f^7$ configuration in $+3$ state	$(iv)$ $Eu$
$(E)$ Lanthanoid with $4f^{14}$ configuration in $+3$ state	$(v)$ $Gd$
-	$(vi)$ $Dy$

In the lanthanoid series,the basicity of lanthanoid hydroxides $Ln(OH)_3$:

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