Name a reducing agent
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Sulfur di oxide
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Hydrogen sulfide
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Sulfur
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Pernicious anemia
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Correct answer
Explanation
Hydrogen sulfide (H2S) acts as a reducing agent because it can donate electrons (sulfur is oxidized from -2 to higher oxidation states). Sulfur dioxide is actually an oxidizing agent in most reactions.
AI explanation
Hydrogen sulfide (H2S) acts as a reducing agent because the sulfur atom in it is in a low oxidation state (-2) and readily gets oxidized to elemental sulfur or higher oxidation states, donating electrons to other substances in the process. This reducing behavior is a well-known property used in various chemical reactions and qualitative analysis tests.