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One of the oxoacids of nitrogen. Colourless, moderate acid with a pungent odour, that exists only in aqueous solution.
A compound ion, the main source of nitrogen for plants.
One of the raw materials of traditional photography.
A colourless, heavier-than-air gas, an intermediate in the production of nitric acid.
A reddish-brown toxic gas, very reactive due to its unpaired electron.
A compound ion produced from carbonic acid by releasing protons.
Colourless, odourless liquid produced by dissolving carbon dioxide in water.
A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.