The process used to manufacture H2SO4 commercially is
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This SSC CGL Chemistry question asks: “The process used to manufacture H2SO4 commercially is” The correct answer is Contact process. Contact process: SO2 + O2 gives SO3 (with V2O5 catalyst) then SO3 + H2O gives H2SO4. Option A (“Haber process”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option C (“Solvay process”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“Birkeland-Eyde process”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question.