Question

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

• A. The +4 oxidation state of cerium is not known in solutions
• B. The +3 oxidation state of cerium is more stable than the +4 oxidation state
• C. The common oxidation states of cerium are +3 and +4
• D. Cerium (IV) acts as an oxidizing agent.

Answer 1

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

(+4) oxidation state of cerium is also known in solution. The formation of Ce(+4) is favoured by its noble gas configuration, but it is a strong oxidant reverting to thecommon +3 state.