🔍 Key Concepts

• Common toxic gases in maritime environments such as those found in cargo holds, pump rooms, or sewage systems • The distinctive smells associated with certain gases (e.g., bleach, swimming pools, rotten eggs) • Difference between toxic gases and non‑toxic salts like table salt

💭 Think About

• Which of these options is actually a gas at normal temperatures and used/encountered on ships? • Which substance is well known in industry and safety training for having a rotten egg odor warning of danger? • Are any of the choices common everyday substances you know do not smell like rotten eggs?

✅ Before You Answer

• Eliminate any option that is not a gas under normal conditions • Recall which gas is often mentioned in confined space entry training as having a rotten egg smell • Be sure you can distinguish between acidic/industrial gases and ordinary table salt before selecting your answer