Consider the following statements: (I) L a O H 3 is the least basic among hydroxides of lanthanides. (II) Z r 4 + and H f 4 + possess almost the same ionic radii. (III) C e 4 + can act as an oxidizing

Question

Consider the following statements: (I) L a O H 3 is the least basic among hydroxides of lanthanides. (II) Z r 4 + and H f 4 + possess almost the same ionic radii. (III) C e 4 + can act as an oxidizing agent. Which of the above is/are true?

TestHub · Accepted Answer

The basic character of hydroxides decreases from $L a {(O H)}_{3}$ to $L u {(O H)}_{3}$ . Due to smaller size of $Lu,$ the $Lu - OH$ bond attains more covalent character.
Also, due to Lanthanide contraction ${Zr}^{4+}$ and ${Hf}^{4+}$ possess almost the same ionic radii.
${Ce}^{4+}$ is a strong oxidant.

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