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Cerium `(Z= 58)` is an important nember of the lanthanoids . Which of the following statements about cerium is incorrect ?
A. The +4 oxidation state of cerium is not know in solution.
B. The +3 oxidation state of cerium is more stable than the +4 oxidation state
C. The common oxidation state of cerium are +3 and +4
D. Cerium (IV) acts as an oxidising agent.

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Correct Answer - A
`+4` oxidation state of cerium is also know in solution.

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