Which of the following statements is NOT inco | vedclass

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(B) $1$. $La(OH)_3$ is more basic than $Lu(OH)_3$ because basicity decreases as ionic radius decreases across the lanthanoid series. Thus, option $A$

Vedclass · Accepted Answer

The ionic radius of ions decreases in the lanthanoid series.

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(B) $1$. $La(OH)_3$ is more basic than $Lu(OH)_3$ because basicity decreases as ionic radius decreases across the lanthanoid series. Thus, option $A$ is incorrect.$2$. The ionic radius of $Ln^{3+}$ ions decreases across the lanthanoid series due to lanthanoid contraction. This statement is correct.$3$. $La$ $(Z=57)$ is a $d$-block element, not a $4f$ element, so it is not a lanthanoid. Thus, option $C$ is incorrect.$4$. The atomic radii of $Zr$ $(160 \ pm)$ and $Hf$ $(159 \ pm)$ are very similar due to lanthanoid contraction. This statement is also correct. However, in standard multiple-choice questions of this type, the most fundamental property described is the decrease in ionic radius.

Which of the following statements is $NOT$ incorrect?

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