Which equation represents and oxidation/reduction (redox) reaction? a) zns(s) + 2hcl(aq) → zncl2(aq) + h2s(g) b) h2so4(aq) + 2koh(aq) → k2so4(aq) + 2h2o(l) c) 2al(no3)3(aq) + 3zn(s) → 2al(s) + 3zn(no3)2(aq) d) na2co3(aq) + ca(no3)2(aq) → caco3(s) + 2nano3(aq)

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