Final answer:
The reaction between ammonia and oxygen to produce nitrogen monoxide and water vapor in the presence of a platinum catalyst is true. NO is not a catalyst but a product when reacting with oxygen. Adding more catalyst does not change the concentrations of reactants and products at equilibrium; it only speeds up the reaction.
Step-by-step explanation:
The statement that gaseous ammonia and oxygen react in the presence of a platinum catalyst to produce nitrogen monoxide gas and water vapour is True. The overall reaction of nitrogen oxides with oxygen is complex and can generally involve various intermediate species and reactions. Regarding the question about NO acting as a catalyst for decomposition, NO is not a catalyst but a product in the reaction where nitrogen dioxide (NO₂) reacts with molecular oxygen (O₂). The reaction of ammonia (NH₃) with oxygen (O₂) to form nitrogen monoxide (NO) and water vapor (H₂O) does indeed occur in the presence of a catalyst like platinum. Regarding water gas reactions and the addition of a catalyst, adding more catalyst at equilibrium would not change the concentrations of H₂, CO, and CH₃OH since catalysts don't affect the position of equilibrium; they only increase the rate at which equilibrium is achieved.