[sammyg2]

Hydrosulfuric acid? You mean hydrogen sulfide?

Not effective at all as a weapon unless the victim is in an enclosed room.
I work with the stuff on a daily basis, and even wear an H2S monitor at all times at work.

Now Hydrofluoric acid, that would be a different story. I'm certified to work with it and have for many years.

Neither one can even come close to compare as far as killing power to the stuff that sadam used against the kurds.
Sarin gas can kill at very low concentrations (0.01 milligram per kilogram of body weight ). HF and H2S both need extremely high concentrations in comparison to kill.