溶液中的置换反应:金属+盐溶液=盐+金属,如:Fe+CuSO4=FeSO4+Cu2=Pb+Zn2Zn+ 2AgNO3= Zn 2+ 2Ag Zn + CuSO4 = ZnSO4 + Cu Zn + 2AgNO3= Zn 2+ 2Ag Zn+Pb2=Pb+Zn2四、复分解反应1.概