What four products are generated by complete combustion?

Complete combustion is a chemical reaction that occurs when a fuel burns in the presence of an adequate supply of oxygen. The primary products of complete combustion are water vapor, carbon dioxide, heat, and non-combustible ashes.

Water vapor is produced as a result of the hydrogen atoms in the fuel reacting with oxygen. Carbon dioxide is formed from the carbon atoms in the fuel also reacting with oxygen. The release of heat occurs due to the energy produced during the combustion reaction, which is a significant aspect for heating applications. Finally, non-combustible ashes are the residue left after the combustible materials in the fuel have been completely oxidized.

In contrast, options that list products such as carbon monoxide or smoke reflect incomplete combustion, which occurs when the fuel or oxygen supply is inadequate. These conditions result in harmful byproducts that can be dangerous and are not characteristic of complete combustion. Therefore, the correct answer encompasses the accurate and complete set of products generated when combustion occurs efficiently.