ygr9ax8rkr ygr9ax8rkr 14-12-2022 Chemistry Answered Ammonia, NH3, is used to produce nitric acid, HNO3. This happens in a three-stage process. Stage 1 is a redox reaction. 4NH3 + 502 - 4NO + 6H20 Identify what is oxidised in stage 1. Give a reason for your answer. substance oxidised reason