Match the following items of List-I with those in List-II and choose the correct option \begin{array}{|l|l|} \hline \multicolumn{1}{|c|}{ List-I } & \multicolumn{1}{|c|}{ List-II } \\ \hline a) \left[\mathrm{S}_2 \mathrm{O}_3\right]^{2-} & I. Paramagnetic \\ \hline b) \mathrm{H}_2 \mathrm{O}_2 & II. Toxic gas \\ \hline c) \mathrm{H}_2 \mathrm{~S} & III. Strong reducing agent \\ \hline d) \mathrm{S}_2 & IV. Disproportionate in presence of \mathrm{Mn}^{2+} \\ \hline \end{array}

• A

  $(\mathrm{a} \rightarrow \mathrm{IV}),(\mathrm{b} \rightarrow \mathrm{II}),(\mathrm{c} \rightarrow \mathrm{I}),(\mathrm{d} \rightarrow \mathrm{III})$
• B

  $(\mathrm{a} \rightarrow \mathrm{I}),(\mathrm{b} \rightarrow \mathrm{III}),(\mathrm{c} \rightarrow \mathrm{IV}),(\mathrm{d} \rightarrow \mathrm{II})$
• C

  $(\mathrm{a} \rightarrow \mathrm{III}),(\mathrm{b} \rightarrow \mathrm{I}),(\mathrm{c} \rightarrow \mathrm{II}),(\mathrm{d} \rightarrow \mathrm{IV})$
• Correct answer
  D

  $(\mathrm{a} \rightarrow \mathrm{III}),(\mathrm{b} \rightarrow \mathrm{IV}),(\mathrm{c} \rightarrow \mathrm{II}),(\mathrm{d} \rightarrow \mathrm{I})$

Hence, the correct answer is option: 'D'.