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JEE Main2004Chemistryd and f Block ElementsActual

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

Options

  1. AThe common oxidation states of cerium are +3 and +4
  2. BCerium (IV) acts as an oxidizing agent
  3. CThe +4 oxidation state of cerium is not known in solutions
  4. DThe +3 oxidation state of cerium is more stable than the +4 oxidation state

Correct answer

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

Step-by-step solution

Oxidation potential of Ce ( IV ) in aqueous solution is supposed to be - ve i.e. -0.784 ~V at 25^ C

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