NEET ChemistryClass 12The lanthanoidsMediumStatement based

Most lanthanoids prefer the +3 state, but a few show +2 or +4. Which of the statements below are correct?

Statement I: The principal oxidation state of the lanthanoids is +3.
Statement II: Ce⁴⁺ in aqueous solution is a strong oxidising agent.
Statement III: The lanthanoid contraction arises because 4f electrons shield one another poorly from the nuclear charge.
Statement IV: Eu²⁺ is a strong oxidising agent.

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Most lanthanoids prefer the +3 state, but a few show +2 or +4. Which of the statements below are correct?

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