You will be given a definition of a task first, then some input of the task.
In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

At standard temperature and pressure, it is a toxic and corrosive gas with a strong odor, and until the advent of haloalkanes like Freon, it was widely used as a refrigerant because it easily liquefies under pressure. Its liquid form is also a well-known non-aqueous ionizing solvent. Another of its important uses is in the production of nitric acid, which is then used in explosives and fertilizer. FTP, name this Hydrogen-Nitrogen compound usually formed when its two component gases are reacted over an iron catalyst, with aluminum oxide and potassium oxide promoters.
Output:
Science