Carry out transformations showing the chemical properties of sulfuric acid.

Let us compose the reaction equations for the transformation chain:
H2S – S – SO2 – SO3 – H2SO4 – Ca (HSO4) 2;
2H2S + O2 = 2S + 2H2O – redox reaction (ORR), sulfur was obtained;
S + O2 = SO2 – the reaction of the compound, sulfur oxide is formed (2);
2SO2 + O2 = 2SO3 – OBP, sulfur trioxide obtained;
SO3 + H2O = H2SO4 – compound reaction, sulfuric acid is formed;
H2SO4 + CaCi2 = CaSO4 + 2HCl – ion exchange reaction, obtained calcium sulfate;
CaSO4 + H2SO4 (conc.) = Ca (H2SO4) 2 – compound reaction, calcium hydrogen sulfate was obtained.