The chemical reactions involved in the conversion of sulfur dioxide (SO2) to sulfuric acid (H2SO4) are as follows:

SO2 + O2 → SO3 (sulfur trioxide)SO3 + H2O → H2SO4 (sulfuric acid)

Sulfuric acid can then react with zinc (Zn) to form zinc sulfate (ZnSO4):

Zn + H2SO4 → ZnSO4 + H2

Overall, the reaction can be represented as:

SO2 + O2 + H2O + Zn → ZnSO4 + H2

This process is known as the wet sulfuric acid process and is one of the methods used to produce sulfuric acid industrially.