Tags: Chemical Compound, Chemical Substance.
Hydrogen selenide is an inorganic compound with the formula H2Se. It is the simplest (and virtually the only) hydride of selenium. H2Se is a colorless flammable gas under standard conditions. It is the most toxic selenium compound with an exposure limit of 0.05 ppm over an 8 hour period. This compound has a very irritating smell resembling that of decayed horseradish but smells of rotten eggs at higher concentrations.
