Which equation describes a redox reaction? A)2Al(s)+ 3H₂SO₄(aq)→ Al₂(SO₄)₃(aq)+ 3H₂(g) B)2KBr(aq)+ Pb(NO₃)₂(aq)→ 2KNO₃(aq)+ PbBr₂(s) C)CaBr₂(aq)+ H₂SO₄(aq)→ CaSO₄(s)+ 2HBr(g) D)H⁺(aq)+ OH^-(aq)→ H₂O(l) E)CO₃^2-(aq)+ HSO₄^-(aq)→ HCO₃^-(aq)+ SO₄^2-(aq)

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Choice A shows a redox reaction because aluminum (Al) is oxidized and hydrogen sulfite (HSO3-) is reduced. The aluminum goes from an oxidation state of 0 to +3, meaning it lost electrons and was oxidized. The hydrogen sulfite goes from an oxidation state of +5 to +4, meaning it gained electrons and was reduced.

Which Equation Describes a Redox Reaction