Question

In reaction $S{O}_2+H_{2}S\to 2H_{2}O+3S$, the reducing agent is:

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

Answer 1

The correct option is B $H_{2}S$

An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.
$S{O}_2+H_{2}S\to 2H_{2}O+3S$
+4 -2 0
As $H_{2}S$ oxidises, so its reducing agent.