MCQ
Consider the following statements

$(I)\,\,La(OH)_3$ is the least basic among hydroxides of lanthanides.

$(II) \,\,Zr^{4+}$ and $Hf^{4+}$ posses almost the same ionic radii.

$(III)\,\,Ce^{4+}$ can as an oxidizing agent

Which of the above is/are true ?

  • A
    $(I)$ and $(III)$
  • $(II)$ and $(III)$
  • C
    $(II)$ only
  • D
    $(I)$ and $(II)$

Answer

Correct option: B.
$(II)$ and $(III)$
b
As a result of lanthanide contraction $Zr^{4+}$ and $Hf^{4+}$ possess almost the same ionic radii. $Ce^{4+}$ is an oxidising agent. $Ce^{4+}$ gains electron to acquire more stable $Ce^{3+}$ state. $La(OH)_3$ is the most basic among lanthanide hydroxides.

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