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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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