Hydrogen sulfide has an odor resembling which of the following?

Hydrogen sulfide is well-known for its distinctive and potent odor that is often compared to that of rotten eggs. This characteristic smell is due to the presence of sulfur in the compound, which is similar to the odor produced during the decomposition of organic matter containing sulfur. The pungent smell serves as a warning sign of its presence since hydrogen sulfide is a toxic gas that can be harmful in high concentrations.

In contrast, the other options represent different types of smells that do not accurately capture the essence of hydrogen sulfide's odor profile. Ammonia has a sharp, irritating smell that is distinctly different, while chlorine gas has a strong, bleach-like odor. Decayed wood may produce a musty or earthy scent, which is also not reminiscent of rotten eggs. Thus, the association of hydrogen sulfide with the smell of rotten eggs is not only widely recognized but also crucial for safety awareness in environments where this gas may be present.