1 D
2 D
3 (1)石灰石是难溶物,所以不应写成离子式.
CaCO3+2H+==Ca2++ +co2↑+H2O
(2) 盐酸不会讲铁离子氧化成正三价,
Fe+2H+====2Fe3++H2↑
(3) 生成的氨水是弱电解质,不能写成离子式
Ba²++ +2OH-- +2NH4++ +SO4²ˉ===2NH3H2O+BaSO4↓
4 (1) Zn +H2SO4=ZnSO4+H2↑
(2) Na2S +CuCL2 =CuS ↓+2NaCL
(3) NaHCO3 +HCL = NaCL + CO2 ↑+H2O