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Question: Answered & Verified by Expert
Cerium $(Z=58)$ is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?
Chemistryd and f Block ElementsJEE MainJEE Main 2004
Options:
  • A
    The common oxidation states of cerium are $+3$ and $+4$
  • B
    Cerium (IV) acts as an oxidizing agent
  • C
    The $+4$ oxidation state of cerium is not known in solutions
  • D
    The $+3$ oxidation state of cerium is more stable than the $+4$ oxidation state
Solution:
2953 Upvotes Verified Answer
The correct answer is:
The $+4$ oxidation state of cerium is not known in solutions
Oxidation potential of $\mathrm{Ce}(\mathrm{IV})$ in aqueous solution is supposed to be $-$ ve i.e. $-0.784 \mathrm{~V}$ at $25^{\circ} \mathrm{C}$

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