Cerium ( Z = 58 ) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect? - Chemistry MCQ AIEEE 2004 2026 | ExamTest.live

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Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?

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 & Step-by-step Explanation

Statement C is incorrect because the + 4 oxidation state of Cerium is well known in aqueous solutions (e.g., Ceric ammonium sulfate), where it acts as a strong oxidizing agent (reducing to + 3). The standard reduction potential for Ce^{4 +} / Ce^{3 +} is around + 1.74 V .

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Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect?

The common oxidation states of cerium are + 3 and + 4

Cerium (IV) acts as an oxidizing agent

The + 4 oxidation state of cerium is not known in solutions

The + 3 oxidation state of cerium is more stable than the + 4 oxidation state

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