In the lanthanide series,the basicity of the | vedclass

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(B) Across the lanthanide series,the ionic radius of the $Ln^{3+}$ ions decreases due to lanthanide contraction. As the size of the $Ln^{3+}$ cation d

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Decreases

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(B) Across the lanthanide series,the ionic radius of the $Ln^{3+}$ ions decreases due to lanthanide contraction. As the size of the $Ln^{3+}$ cation decreases,the $Ln-OH$ bond becomes more covalent and less ionic. Since basicity is directly related to the ease of releasing $OH^-$ ions,the decrease in ionic character leads to a decrease in basicity. Therefore,the basicity of lanthanide hydroxides decreases from $La(OH)_3$ to $Lu(OH)_3$.

In the lanthanide series,the basicity of the lanthanide hydroxides:

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