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Which lanthanoid is well known to exhibit the +4 oxidation state in aqueous solution as a strong oxidising agent?
ACe — Ce⁴⁺/Ce³⁺, E° = +1.74 V
BPm
CLa
DLu
Answer & Solution
Correct answer: A. Ce — Ce⁴⁺/Ce³⁺, E° = +1.74 V
**Cerium** is unique: Ce⁴⁺ has noble-gas Xe configuration (4f⁰) → relatively stable. **E°(Ce⁴⁺/Ce³⁺) = +1.74 V** → Ce⁴⁺ is a strong oxidiser (used in titrations, e.g., cerimetry). Note: Ce⁴⁺ can in principle oxidise water but the reaction is kinetically slow.
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