Câu 1: 1) NO + O2 → NO2 2) Ca(OH)2 + H2SO4 → CaSO4 + H2O 3) Ca(OH)2 + Na2CO3 → CaCO3 + NaOH 4) Na2S + H2SO4 → Na2SO4 + H2S 5) Na2S + HCl → NaCl + H2S 6) K3PO4 + Mg(OH)2 → KOH + Mg3(PO4)2

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