4RuCl3 + 2H2S + 2H2O → RuS2 + 2RuCl2 + RuO2 + 8HCl
Ruthenium(III) chloride react with hydrogen sulfide and water to produce ruthenium(IV) sulfide, ruthenium(II) chloride, ruthenium(IV) oxide and hydrogen chloride. Hydrogen sulfide - saturated solution.