Consider the following statements:
I. La(OH) | vedclass

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(B) $I$. $La(OH)_3$ is the most basic among lanthanide hydroxides because basicity decreases as the ionic radius decreases from $La$ to $Lu$. Thus,sta

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$II$ and $III$

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(B) $I$. $La(OH)_3$ is the most basic among lanthanide hydroxides because basicity decreases as the ionic radius decreases from $La$ to $Lu$. Thus,statement $I$ is false.
$II$. Due to lanthanide contraction,the ionic radii of $Zr^{4+}$ $(0.79 \ \mathring{A})$ and $Hf^{4+}$ $(0.78 \ \mathring{A})$ are almost identical. Thus,statement $II$ is true.
$III$. $Ce^{4+}$ is a strong oxidizing agent because it readily gains an electron to attain the more stable $Ce^{3+}$ oxidation state. Thus,statement $III$ is true.
Therefore,statements $II$ and $III$ are true.

Consider the following statements:
$I$. $La(OH)_3$ is the least basic among hydroxides of lanthanides.
$II$. $Zr^{4+}$ and $Hf^{4+}$ possess almost the same ionic radii.
$III$. $Ce^{4+}$ can act as an oxidizing agent.
Which of the above is/are true?

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Consider the following statements: $I$. $La(OH)_3$ is the least basic among hydroxides of lanthanides. $II$. $Zr^{4+}$ and $Hf^{4+}$ possess almost the same ionic radii. $III$. $Ce^{4+}$ can act as an oxidizing agent. Which of the above is/are true?