Discussion
Which one of the following materials on combustion is expected to exit highest NH3 ?
Answer: C
The key gives dung cake.
Ammonia from burning comes from the nitrogen in the fuel. Cattle dung is rich in nitrogen from undigested protein and urea, much richer than wood, so dung-cake fires emit more ammonia than the other fuels.
Wood has a low nitrogen content, petrol contains almost no nitrogen (its nitrogen oxides come from air in the engine, not ammonia), and plastic waste is mostly carbon and hydrogen, apart from nitrogen-containing polymers such as nylon.
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