1. Tardigrade
  2. Question
  3. Chemistry
  4. Consider the following statements I. La(OH)3 is least basic among hydroxides of lanthanides. II. Zr4+ and Hf4+ possess almost the same ionic radii. III. Ce4+ can act as an oxidising agent. Which of the above is/are true?

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Q. Consider the following statements
I. $La(OH)_3$ is 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 oxidising agent.
Which of the above is/are true?

The d-and f-Block Elements

Solution:

$La(OH)_3$ is most basic. Hence, $(I)$ is wrong. $(II)$ is correct due to lanthanoid contraction. $(Ill)$ is correct because $Ce^{4+}$ tends to change to stable $Ce^{3+}$.