Question

Which of the following behaves as both oxidizing and reducing agents ?

• A. $H_{2}S{O}_4$
• B. $S{O}_2$
• C. $H_{2}S$
• D. $HN{O}_3$

Answer 1

The correct option is B $S{O}_2$

SO${}_2$ The O.S of sulphur is +4 it can be oxidised to +6 oxidation state and can be reduced to reduced 0 oxidation state. So, it acts as both an oxidising and reducing agent.

SO${}_2$ $\to$ $S{O}_3^{2-}$(oxidation)

SO${}_2$ $\to$ S (reduction)