Write the reaction equation: S- H2S-SO2-K2SO3- SO2

S + H2 = H2S (sulfur vapor is combined with hydrogen at a temperature of 200 degrees);

2H2S + 3O2 = 2H2O + 2SO2 (hydrogen sulfide burns in air, and sulfur dioxide is formed);

SO2 + 2KOH = K2SO3 + H2O (sulfur dioxide is an acidic oxide, easily interacts with alkalis);

K2SO3 + 2HCl = SO2 + H2O + 2KCI (sulfurous acid H2SO3 is a weak acid, therefore strong acids, in this example hydrochloric, displace it from salt solutions, while it immediately decomposes into water and sulfur dioxide H2SO3 = H2O + SO3)