Which statement correctly pairs a hazard class with its characteristic?

Which statement correctly pairs a hazard class with its characteristic?

• A. Hazard Class 2.3: toxic gas
• B. Hazard Class 6.1: oxidizing substances
• C. Hazard Class 4: explosives
• D. Hazard Class 1.1: flammable liquid

Answer: (A)

The key idea is understanding how hazard class numbers map to the material’s characteristic. The correct pairing is that toxic gas belongs to Class 2.3. This subclass specifies gases that can cause toxic effects, typically through inhalation, making them particularly hazardous in the atmosphere. The other options mix up the class-to-characteristic associations: oxidizers are Class 5.1, not 6.1; explosives fall under Class 1, not 4; and flammable liquids are Class 3, not 1. Class 6.1 covers toxic substances, not oxidizing agents. Recognizing these mappings helps you anticipate appropriate precautions and response actions.

The key idea is understanding how hazard class numbers map to the material’s characteristic. The correct pairing is that toxic gas belongs to Class 2.3. This subclass specifies gases that can cause toxic effects, typically through inhalation, making them particularly hazardous in the atmosphere. The other options mix up the class-to-characteristic associations: oxidizers are Class 5.1, not 6.1; explosives fall under Class 1, not 4; and flammable liquids are Class 3, not 1. Class 6.1 covers toxic substances, not oxidizing agents. Recognizing these mappings helps you anticipate appropriate precautions and response actions.