- As a reducing agent, SO₂ is oxidized, meaning the oxidation state of sulfur increases from +4 to +6 (e.g., in SO₃ or sulfates). Example: SO₂ + HNO₃ → H₂SO₄ + NO₂. - As an oxidizing agent, SO₂ is reduced, meaning the oxidation state of sulfur decreases from +4 to values like 0 (in S) or -2 (in H₂S or sulfides). Example: SO₂ + 2H₂S → 3S + 2H₂O. - Since it can undergo both oxidation and reduction reactions depending on the reactant it interacts with, SO₂ exhibits properties of both reducing and oxidizing agents.
SO₂ acts as
Asked in TNPSC CS Prelims 2019 · Topic: Inorganic Chemistry (Chemistry of Main Group Elements (s-block and p-block))
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