Explanation

Hydrogen sulphide gas is a naturally occurring chemical.

The gas has a characteristic rotten egg odor at low concentrations.

Hydrogen sulphide gas (H 2 S) is a colorless gas

Hydrogen sulphide is produced by reacting a metal sulphide (Ferrous sulphide) with a dilute acid (Sulphuric acid).

The element responsible for the rotten egg-like smell of Hydrogen sulphide is Sulphur (S).