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What does the letter "X" preceding a Hazard Identification Number (e.g., "X338...

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What does the letter "X" preceding a Hazard Identification Number (e.g., "X338") on an ADR orange plate warn emergency responders about?

The substance must be transported at sub-zero temperatures

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The substance reacts dangerously with water (water must not be used except with specialist approval)

100%

The substance is explosive in open air

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The substance is extremely toxic to marine life

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