Which of the following hazard classes do NOT use the Packing Group I/II/III system to indicate danger level?

Flammable liquids (Class 3) and corrosives (Class 8), these are always exempt from packing groups

All nine hazard classes use packing groups identically, with no exceptions

Only radioactive materials (Class 7) are exempt from packing groups; every other class uses them

Hazmat Table & Classification Test 2/2

✓

Correct!

Correct. Explosives (Class 1) are categorized by division (1.1 through 1.6) based on the type of hazard they present, and gases (Class 2) are categorized by division (2.1 flammable, 2.2 non-flammable/non-toxic, 2.3 poisonous), neither class uses the I/II/III packing group system applied to most other classes.

✗

Not quite.

Wrong. Flammable liquids and corrosives are two of the classes that DO use packing groups, that's exactly why you see PG I/II/III assignments on Class 3 and Class 8 shipping papers in scenarios like sulfuric acid or ethanol.

The correct answer is A: Explosives (Class 1) and Gases (Class 2), these use their own division and classification systems instead of packing groups.

✗

Not quite.

Wrong. This question exists precisely because not every class uses packing groups, explosives and gases are classified by division instead, a distinction testable on the hazmat knowledge exam.

The correct answer is A: Explosives (Class 1) and Gases (Class 2), these use their own division and classification systems instead of packing groups.

✗

Not quite.

Wrong. Radioactive materials (Class 7) have their own separate categorization system too, but explosives and gases are the pair most directly called out as not using packing groups.

The correct answer is A: Explosives (Class 1) and Gases (Class 2), these use their own division and classification systems instead of packing groups.