Chemistry · Industrial Chemistry

The correct answer is the oxidation of NH₃. In the Ostwald process, platinum serves as a catalyst for the oxidation of ammonia to produce nitric acid. This process is critical in the industrial synthesis of fertilizers and explosives. The Haber process uses iron as a catalyst for ammonia synthesis, and the Contact process uses vanadium(V) oxide for sulfuric acid production, making them incorrect options for this specific catalyst usage.

Option A is incorrect. The Haber process involves the synthesis of ammonia and typically uses iron (Fe) as a catalyst, often promoted with Al₂O₃ and K₂O.

Option B is incorrect. The Contact process, used for producing sulfuric acid, employs vanadium(V) oxide (V₂O₅) as a catalyst.

Option C is correct. In the Ostwald process for producing nitric acid, platinum is used as a catalyst in the oxidation of ammonia (NH₃).