题型一直接考查离子反应方程式的正误判断1.下列表示对应化学反应的离子方程式正确的是().A.FeCl3溶液与Cu的反应:Cu+Fe3+=Cu2++Fe2+B.NO2与水的反应:3NO2+H2O=2NO-3+NO+2H+C.醋酸溶液与水垢中的CaCO3反应:CaCO3+2H+=Ca2++H2O+CO2↑ The question type has been inspected positive and negative ion reaction equation judgment 1. The following is the corresponding chemical reaction ion equation is correct () .A.FeCl3 solution and Cu reaction: Cu + Fe3 + = Cu2 ++ Fe2 + B.NO2 and water Reaction: 3NO2 + H2O = 2NO-3 + NO + 2H + C. Acetic acid solution and the scale of the reaction of CaCO3: CaCO3 + 2H + = Ca2 ++ H2O + CO2 ↑