1.X+酸→盐+水2.X+水→碱则X是.A.CaO B.Fe2O3 C.CO2 D.NaOH

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1.X+酸→盐+水2.X+水→碱则X是.A.CaO B.Fe2O3 C.CO2 D.NaOH
1.X+酸→盐+水2.X+水→碱则X是.A.CaO B.Fe2O3 C.CO2 D.NaOH

1.X+酸→盐+水2.X+水→碱则X是.A.CaO B.Fe2O3 C.CO2 D.NaOH
CaO+2HCl=CaCl2+H2O,
CaO+H2O=Ca（OH）2

1.X+酸→盐+水2.X+水→碱 则X是.A.CaO B.Fe2O3 C.CO2 D.NaOH