Question

Which one of the following acts as a strong oxidising agent ?

• A. $T{b}^{4+}$
• B. $S{m}^{2+}$
• C. $E{u}^{2+}$
• D. $Y{b}^{2+}$

Answer 1

The correct option is A $T{b}^{4+}$

All inner-transition elements that have a +2 oxidation state, change to +3 and act as reducing agents. While those that have a +4 oxidation state tend to change to +3 oxidation state and act as oxidising agents. Therefore, $T{b}^{4+}$ acts as an oxidising agent.