Which agent is described as a greenish-yellow gas with a pungent odor?

Which agent is described as a greenish-yellow gas with a pungent odor?

• A. Phosgene
• B. Chlorine gas
• C. Mustard gas
• D. Dushaqiang (TETS)

Answer: (B)

Chlorine gas is identified by its greenish-yellow color as a gas and its strong, pungent odor, often described as bleach-like. This combination distinguishes it from other agents: phosgene is colorless, mustard gas is a viscous liquid at room temperature with a garlic-like odor, and TETS isn’t described by this color-odor profile. The test hinges on matching the described physical properties to the agent, and the greenish-yellow gas with a pungent odor fits chlorine gas best.

Chlorine gas is identified by its greenish-yellow color as a gas and its strong, pungent odor, often described as bleach-like. This combination distinguishes it from other agents: phosgene is colorless, mustard gas is a viscous liquid at room temperature with a garlic-like odor, and TETS isn’t described by this color-odor profile. The test hinges on matching the described physical properties to the agent, and the greenish-yellow gas with a pungent odor fits chlorine gas best.