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Question 860012
JEE Chemistry · Hard

d- and f-Block Elements: Mixed MCQ

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MixedHardQuestion 860012

Question

The most stable oxidation state of cerium (Ce) is:
  1. A
    +4
    Correct
  2. B
    +3
  3. C
    +2
  4. D
    +6

Correct answer

+4

Explanation

Ce can exist in both +3 (4f¹) and +4 (4f⁰, empty f-shell = extra stability due to noble-gas-like configuration) states. CeO₂ (Ce⁴⁺) is a strong oxidising agent. +4 is the most stable for Ce, unlike most lanthanides which prefer +3.

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