Question

Which of the following set of ions act as oxidising agents?

• A. Ce⁴⁺ and Tb⁴⁺
• B. La³⁺ and Lu³⁺
• C. Eu²⁺ and Yb²⁺
• D. Eu²⁺ and Tb⁴⁺

Answer 1

The Correct Option is A

Oxidizing agents gain electrons and undergo reduction. The typical oxidation states of the provided lanthanides are as follows:

• Ce: Exhibits common oxidation states of +3 and +4. Ce⁴⁺ readily accepts an electron, reducing to Ce³⁺ and functioning as an oxidizing agent.
• Tb: Shows common oxidation states of +3 and +4. Tb⁴⁺ can be reduced to Tb³⁺, thus acting as an oxidizing agent.

La and Lu: Primarily exist in the +3 oxidation state and are not potent oxidizing agents.

Eu and Yb: Display +2 and +3 oxidation states. Eu²⁺ and Yb²⁺ act as reducing agents, readily losing electrons and becoming oxidized.

Consequently, only Ce⁴⁺ and Tb⁴⁺ among the listed choices serve as effective oxidizing agents.