1, CO₂ tác dụng dd NaOH, dd Ca(OH)2, Cu(OH)2

2, CuO tác dụng: dd HCl, dd H2SO4

3, CuO, CaO, Na₂O, CO2, SO2 tác dụng H₂O

4, MgO, Fe2O3, Na₂O tác chung dd H2SO4

5, Cu, Al, Mg, Fe, Zn tác dụng dd HCl

6, dd CuCl2, CaCO₃, dd CuSO4, dd FeCl tác dụng dd NaOH

7 dd KOH, Cu(OH), tác dụng CuSO4

8, Na2CO3, Na2SO4, CaSO3, AgNO3 tác dụng dd HCl

`5.`

`Cu + HCl` $\not\rightarrow$ ko p.ứ

`2Al + 6HCl -> 2AlCl_3 + 3H_2`

`Mg + 2HCl -> MgCl_2 + H_2`

`Fe + 2HCl -> FeCl_2 + H_2`

`Zn + 2HCl -> ZnCl_2 + H_2`

`6.`

`CuCl_2 + 2NaOH -> Cu(OH)_2 + 2NaCl`

`CaCO_3 + NaOH` $\not\rightarrow$ ko p.ứ

`CuSO_4 + 2NaOH -> Cu(OH)_2 + Na_2``SO_4`

`FeCl_3 + 3NaOH -> Fe(OH)_3 + 3NaCl`

`7.`

`2KOH + CuSO_4 -> Cu(OH)_2 + K_2``SO_4`

`Cu(OH)_2 + CuSO_4` $\not\rightarrow$ ko p.ứ

`8.`

`Na_2``CO_3 + 2HCl -> 2NaCl + H_2``O + CO_2`

`Na_2``SO_4 + HCl` $\not\rightarrow$ ko p.ứ

`CaSO_3 + 2HCl -> CaCl_2 + H_2``O + SO_2`

`AgNO_3 + HCl -> AgCl + HNO_3`