Вроде бы так
5.
4HCl + MnO2 -> MnCl2 + Cl2 + 2H2O
6NaOH + 3Cl2 -> 5NaCl + NaClO3 + 3H2O
2NaClO3 -> 2NaCl + 3O2
6.
ZnS + 2HCl -> ZnCl2 + H2S
2H2S + 3O2 -> 2SO2 + 2H2O
SO2 + Ca(OH)2 -> CaSO3 + H2O
7.
NH4Cl + NaOh -> NH3 + H2O + NaCl
NH3 + HNO2 -> N2 + 2H2O