Question

Which of the following ions is a good oxidising agent?

• A. Eu${}^{2+}$
• B. Ce${}^{4+}$
• C. Yb${}^{2+}$
• D. Sm${}^{2+}$

Answer 1

Answer: (B)

Ce${}^{4+}$

Ce${}^{4+}$is a good oxidizing agent. It forms stable Ce${}^{3+}$ion. Ce${}^{4+}$ readily gains an electron to form Ce${}^{3+}$. Thus, cerium is reduced and it oxidises other species.