Which of the following is an example of a Class 2 gas?

• A. Acetylene
• B. Dynamite
• C. Anhydrous Ammonia
• D. Hydrogen chloride

Answer: (A)

Gases fall under Class 2, including flammable, nonflammable, and toxic gases. Acetylene is a quintessential example of a Class 2 gas because it is a flammable gas that is stored under pressure in cylinders. That combination—being a gas at room temperature and highly flammable—fits the typical safety context used to teach how to recognize and handle Class 2 hazards.

Dynamite isn’t a gas at all; it’s a solid explosive, so it wouldn’t be described as a Class 2 gas. Anhydrous ammonia and hydrogen chloride are indeed gases, but they are considered toxic gases within the Class 2 category, highlighting different hazard characteristics than the flammable gas example acetylene illustrates.