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Ben Hirst Hazardous Materials Awareness And Operations Practice Exam

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Under the United Nations labeling system, a substance that readily yields oxygen to support combustion would be labeled with which number?
Correct Answer:
5
Explanation:
The key idea is that oxidizers are a distinct hazard class in the UN labeling system. Substances that readily yield oxygen to support combustion are classified as oxidizers, which is hazard class 5. The number 5 on a label identifies that risk, signaling that the material can intensify fires by supplying oxygen to other fuels. This is different from other hazard classes: for example, 3 marks flammable liquids, 7 marks radioactive materials, and 9 marks miscellaneous dangerous goods. So, labeling an oxidizer with the number five accurately communicates the fire-promoting risk and helps responders take appropriate precautions.

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