3. Write the reaction equations in which hydrogen sulfide is oxidized to sulfuric acid:
a) H2S Cl2 H2O →; b) H2S HNO3 →; c) H2S O3 →; d) H2S H2O2 →.
What is the content of hydrogen sulfide in one liter of air if, after its oxidation, 100 ml of a decimolar solution of sodium hydroxide was used to neutralize the formed sulfuric acid?

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