What compound is produced through chemical fixation?

The compound produced through chemical fixation is ammonia (NH3). Chemical fixation refers to the process where atmospheric nitrogen is converted into a more reactive form that plants can use. This often occurs in industrial settings through the Haber-Bosch process, where nitrogen gas (N2) is reacted with hydrogen gas (H2) to produce ammonia.

Ammonia is a vital nutrient for plants as it serves as a key building block for amino acids and nucleic acids, both of which are crucial for plant growth and development. Once produced, ammonia can further be converted to ammonium (NH4) in soil, enhancing its availability to plants.

The other compounds listed do not result from chemical fixation of atmospheric nitrogen in the same direct manner as ammonia. For example, nitric acid is a product of a different chemical pathway involving oxidation, while nitrogen dioxide is a gas that can arise from combustion processes or other reactions but does not represent the fixation of atmospheric nitrogen into a usable form for plants.