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

1. The +4 oxidation state of cerium is not known in solutions
2. The +3 oxidation state of cerium is more stable than the +4 oxidation state
3. The common oxidation states of cerium are +3 and +4
4. Cerium (IV) acts as an oxidizing agent

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

Solution

The statement is incorrect because cerium can exist in the +4 oxidation state in solutions, although it is less stable compared to the +3 state. This means that while +4 cerium can be present, it is not as commonly found in solution as the +3 state.

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