Which of the following is commonly produced as a result of complete combustion?

The process of complete combustion occurs when a fuel reacts with sufficient oxygen, resulting in the most efficient conversion of energy. This type of combustion is characterized by its outputs, which are primarily water and carbon dioxide. When hydrocarbons, such as those found in fossil fuels, undergo complete combustion, they react with oxygen and yield these two specific products.

Water is formed due to the hydrogen atoms in the fuel combining with oxygen, while carbon dioxide is produced from the carbon atoms reacting with oxygen. This process releases a significant amount of energy in the form of heat, which is why combustion is used extensively in engines and heating systems.

In contrast, other products such as soot and carbon monoxide are indicative of incomplete combustion, where there is not enough oxygen to allow the fuel to react fully, hence leading to the formation of undesirable byproducts. Similarly, oxygen is not a product of combustion but rather a reactant necessary for the process to occur.

Thus, the generation of water and carbon dioxide is a clear indication of complete combustion occurring efficiently and responsibly.