Final answer:
The flue gases from the complete combustion of natural gas in air are primarily carbon dioxide (CO2) and water vapor (H2O). However, other pollutants like carbon monoxide (CO), nitrogen oxides (NOx), and sulfur dioxide (SO2) can also be produced.
Step-by-step explanation:
The flue gases from the complete combustion of natural gas in air are primarily carbon dioxide (CO2) and water vapor (H2O). During the combustion process, the carbon in the natural gas combines with oxygen from the air to form carbon dioxide, while the hydrogen combines with oxygen to form water vapor.
However, it's important to note that the combustion process can also produce other pollutants such as carbon monoxide (CO), nitrogen oxides (NOx), and sulfur dioxide (SO2). These pollutants are formed when the combustion is not complete or when the natural gas contains impurities.
Overall, the primary flue gases from the complete combustion of natural gas in air are carbon dioxide and water vapor, which are less harmful to the environment compared to other fossil fuels.