The correct answer is: A. Ammonium
Nitrogen fixation is the process by which atmospheric nitrogen (N2) is converted into ammonia (NH3). This process is essential for life on Earth, as ammonia is a key component of proteins and nucleic acids.
There are two main types of nitrogen fixation: biological nitrogen fixation and industrial nitrogen fixation.
Biological nitrogen fixation is carried out by bacteria, archaea, and some plants. These organisms have special enzymes that allow them to convert nitrogen gas into ammonia.
Industrial nitrogen fixation is carried out by the Haber-Bosch process. This process uses high temperatures and pressures to convert nitrogen gas and hydrogen gas into ammonia.
Ammonium is a positively charged ion with the formula NH4+. It is a common form of nitrogen in the soil and is used by plants as a source of nitrogen.
Hydride is a negatively charged ion with the formula H-. It is not a common form of nitrogen in the soil.
Nitrate is a negatively charged ion with the formula NO3-. It is a common form of nitrogen in the soil and is used by plants as a source of nitrogen.
Chlorite is a negatively charged ion with the formula ClO3-. It is not a common form of nitrogen in the soil.