5. When ammonia is oxidized to form nitric acid, what catalyst is used? a) Platinum-Rhodium gauze b) Vanadium (V) oxide c) Palladium hydride d) Sodium amalgam
Answer: a Explanation: At a temperature of 500 K and a pressure of 9 bars, ammonia is oxidized to nitrogen (II) oxide in the presence of a Pt/Rh gauze catalyst. After that, the nitrous oxide is transformed to nitrogen dioxide, which is subsequently reacted with water to produce nitric acid. The NO that is produced is recycled.
