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

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

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

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

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Cerium (IV) acts as an oxidising agent.

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Solution

The correct option is D The +4 oxidation state of cerium is not known in solutions.
The incorrect statement about the Cerium is only C option.
C: The +4 oxidation state of cerium is not known in solutions [ Incorrect ]
As +4 oxidation state, is common for the Cerium.
The correct statement about the Cerium are as follows:
A: The common oxidation state of Cerium are +3, and +4.
B : The +3 oxidation state of the Cerium is more stable than the +4 oxidation state.
D: Cerium (IV) acts as an oxidising agent

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(Z = 58)

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