Question

Which of the following reactions depicts the oxidising property of $SO_2$?

• A. $SO_2 + H_2O \rightarrow H_2SO_3$
• B. $2H_2S + SO_2 \rightarrow 3S + 2H_2O$
• C. $Cl_2 + SO_2 \rightarrow SO_2 Cl_2$
• D. $2 MnO^{-}_{4} + 5 SO_2 + 2 H_2O \rightarrow 5 SO^{2-}_4 + 2 Mn^{2+} + 4 H^{+}$

Answer 1

Answer: (B)

$2 H_2S + SO_2 \rightarrow 3 S + 2 H_2O$ Here $SO_2$ acts as an oxidising agent and thus oxidises $H_2S$ to $S$.