Consider the following statements. (I)${\rm{La}}{\left( {{\rm{OH}}} \right)_3}$ is the least basic among hydroxides of lanthanides (II) ${\rm{Z}}{{\rm{r}}^{4 + }}$ and ${\rm{H}}{{\rm{f}}^{4 + }}$ possess almost the same ionic radii (III) ${\rm{C}}{{\rm{e}}^{4 + }}$ can act as an oxidizing agent Which of the above is/are true?

NEET UG CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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Understanding +4 | -1

Consider the following statements.

(I)

\mathrm{La}{\left( {\mathrm{OH}} \right)_3}

is the least basic among hydroxides of lanthanides

(II)

\mathrm{Z}{\mathrm{r}^{4 + }}

and

\mathrm{H}{\mathrm{f}^{4 + }}

possess almost the same ionic radii

(III)

\mathrm{C}{\mathrm{e}^{4 + }}

can act as an oxidizing agent

Which of the above is/are true?

View answer and explanation

Correct option: D

(I) only

Option A ((I) and (III)) is incorrect. Option B ((II) and (III)) is correct because

\mathrm{Z}{\mathrm{r}^{4 + }}

and

\mathrm{H}{\mathrm{f}^{4 + }}

possess almost the same ionic radii due to lanthanoid contraction, and

\mathrm{C}{\mathrm{e}^{4 + }}

can act as an oxidizing agent.