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NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice

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. BThe +3 oxidation state of cerium is more stable than +4 oxidation state
  3. CCerium (III) acts as an oxidising agent
  4. DThe +4 oxidation state of cerium is known in solution

Correct answer

C. Cerium (III) acts as an oxidising agent

Step-by-step solution

+4 oxidation state of cerium is also known in solutions. 4f 1 5d 0 6s 0 : Ce +3 4f 0 5d 0 6s 0 : Ce +4 The high charge on Ce 4+ leads to high hydration, hydrated Ce 4+ is hydrolysed giving polymeric species and H + . Ce ( +4 ) is stable in strongly acidic solutions and used as oxidising agent in volumetric analysis.

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