During the practical in the lab when hydrozen sulphide gas having ofensive odour is prpeared for some test you can smell the gas even 50 mtrs away explain the phenomenon?

Answer 1

The ability to smell hydrogen sulfide gas from a distance, even up to 50 meters, is due to its highly volatile nature and low molecular weight, which allow it to diffuse rapidly through the air. Additionally, hydrogen sulfide has a very low odor threshold, meaning that only a small concentration is needed for it to be detected by the human nose. This combination of volatility and sensitivity contributes to its strong and offensive odor, making it easily perceptible even at considerable distances.