Question

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

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

Answer 1

Answer: (B)

$\ce{2H_2S + SO_2 -> 3S + 2H_2O}$

Answer 2

${2 H_2S + SO_2 -> 3 S + 2 H_2O}$ Here S02 acts as an oxidising agent and thus oxidises ${H_2S}$ to S.