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

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

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

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

Cerium (iv) acts as an oxidising agent

answer is A.

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Detailed Solution

The +4 oxidation state for cerium is unknown in solutions. Cerium with oxidation state +4 is more favorable as its the noble gas configuration, but it mostly reverts back to its oxidation state +3.

Hence, the statement 'The common oxidation states of cerium is
+3 and +4' is incorrect and option (A) is correct answer.

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