Which of the following statements is incorrec | vedclass

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(A) $1$. $La(OH)_3$ is more basic than $Lu(OH)_3$ because the basicity decreases as the ionic radius decreases from $La^{3+}$ to $Lu^{3+}$. Thus,state

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$La(OH)_3$ is less basic than $Lu(OH)_3$.

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(A) $1$. $La(OH)_3$ is more basic than $Lu(OH)_3$ because the basicity decreases as the ionic radius decreases from $La^{3+}$ to $Lu^{3+}$. Thus,statement $A$ is incorrect.$2$. Lanthanoid contraction causes a decrease in ionic radii from $Ce^{3+}$ to $Lu^{3+}$. Statement $B$ is correct.$3$. Lanthanum $(Z=57)$ has a partially filled $d$-orbital $(5d^1)$ in its ground state,classifying it as a transition element. Statement $C$ is correct.$4$. Due to lanthanoid contraction,the atomic radii of $Zr$ $(160 \ pm)$ and $Hf$ $(159 \ pm)$ are very similar. Statement $D$ is correct.

Which of the following statements is incorrect?

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