JEE Main Chemistry question

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

(A)The common oxidation states of cerium are and .
(B)The oxidation state of cerium is more stable than the oxidation state.
(C)The oxidation state of cerium is not known in solutions.Correct
(D)Cerium(IV) acts as an oxidizing agent.

Answer: (C)

Solution

Cerium shows both and states in aqueous solution (e.g., ceric ammonium sulfate/nitrate, , is a well-known oxidant used in solution-phase redox titrations), so statement (c) is false. (with stable loss to

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Question ID VK-147351