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In which reaction \( \mathrm{H}_{2} \mathrm{O}_{2} \) acts as reducing agent?
(A) \( \mathrm{Ag}_{2} \mathrm{O}+\mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow 2 \mathrm{Ag}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2} \)
(B) \( 2 \mathrm{KI}+\mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow 2 \mathrm{KOH}+\mathrm{I}_{2} \)
(C) \( \mathrm{PbS}+4 \mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow \mathrm{PbSO}_{4}+4 \mathrm{H}_{2} \mathrm{O} \)
(D) \( \mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{SO}_{2} \longrightarrow \mathrm{H}_{2} \mathrm{SO}_{4} \)
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