Which one of the following statements related to lanthanons is incorrect?

  • A
    Europium shows $+2$ oxidation state.
  • B
    The basicity decreases as the ionic radius decreases from $Pr$ to $Lu$.
  • C
    All the lanthanons are much more reactive than aluminium.
  • D
    $Ce(+4)$ solutions are widely used as oxidizing agent in volumetric analysis.

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The reason for the greater range of oxidation states in actinoids is attributed to:

Which of the following lanthanoid elements exhibits common oxidation states of $+2$ and $+3$?

Describe the atomic and ionic radii of lanthanoids and explain lanthanoid contraction.

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Which orbitals,$4f$ or $5f$,are more capable of participating in bond formation?

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