Question

Which one amongst the following are good oxidizing agents?

A. Sm²⁺
B. Ce²⁺
C. Ce⁴⁺
D. Tb⁴⁺

Choose the most appropriate answer from the options given below:

(1) C only

(2) D only

(3) A and B only

(4) C and D only

Comments

The common oxidation state of lanthanide is +3. The lanthanide ions having +2 oxidation state undergo oxidation readily, hence they act as reducing agents. The lanthanide ions having  +4 oxidation state undergo reduction readily, hence they act as oxidising agents.

Hence,
Ce+4 and Tb+4 act as oxidising agent

Answer 1

(4) C and D only

Ce⁺⁴ and Tb⁺⁴ act as oxidising agent.