smells like rotten eggs!
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Pure hydrogen is an odorless, colorless, and tasteless gas. It does not have a discernible odor.
The symbol for hydrogen sulfide is H2S. It is a colorless gas with a characteristic foul odor, similar to that of rotten eggs.
Hydrogen gas itself is odorless and colorless. If you can smell hydrogen gas, it likely has an odorant added for safety reasons, such as a sulfur-like smell.
Hydrogen chloride is a compound composed of hydrogen and chlorine atoms bonded together, while hydrogen gas and chlorine gas are pure elements. Hydrogen gas is diatomic, consisting of two hydrogen atoms bonded together, while chlorine gas is diatomic, with two chlorine atoms bonded together. Hydrogen chloride is a colorless gas with a pungent odor, while hydrogen gas is colorless and odorless, and chlorine gas is a yellow-green gas with a strong odor.
Hydrogen sulfide (H2S) is a compound made up of hydrogen and sulfur. It is a colorless, flammable gas with a characteristic foul odor, often described as resembling rotten eggs.
Physical.Added:Odor is by many considered as chemical interaction with nasal odor receptors, though this is still under dispute.I, personally, would be more of the 'physical' odor perception, because the odor-creating molecules (eg. in perfume) do not change at all while being 'percepted' in your nose.However there are also undoubtly pure chemical odor perceptions, like those of (gaseous) 'acids', 'ammonia', 'formalin' and hydrogen sulfide.