Question

Which of the following sulphur containing species can not act as oxidising agent?

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

Answer 1

Answer: (A)

Oxidation number of sulphur in $H_{2}S,H_{2}S{O}_4{H}_{2}S{O}_3$ and $S{O}_2$ are $-2,+6,+4$ and $+4$.
Thus, $H_{2}S$ can act only as reducing agent.