Indiana HazMat Operations Practice Test

A 4-digit UN/NA number provides what information when using the ERG?

The chemical's molecular formula. The hazard and protective actions linked by the UN/NA number. The shipping name and packing group. The storage temperature range.

Correct Answer:

The hazard and protective actions linked by the UN/NA number.

Explanation:

The four-digit UN/NA number acts as the lookup key in the ERG to access that specific material’s entry. That entry lists the hazards associated with the material and the protective actions responders should take, such as recommended PPE, evacuation or isolation guidance, and initial response steps. The number itself doesn’t give you the molecular formula, the packing group, or storage temperature; those details aren’t what the ERG uses the UN number to provide.

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