Practice question

What does a letter 'X' preceding the Hazard Identification Number on an orange panel indicate (e.g., 'X333' or 'X88')?

  1. The substance has expired
  2. The substance reacts violently and dangerously with WATER (prohibición absoluta de usar agua para apagar o enfriar)
  3. The substance is completely harmless and non-toxic
  4. The transport is exempt from highway tolls

Answer: B — The substance reacts violently and dangerously with WATER (prohibición absoluta de usar agua para apagar o enfriar)

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