Which column in the DGR Table contains the serial number assigned to each article or substance under the UN classification system?

• A. Column A - UN or ID Number
• B. Column B - Proper Shipping Name/Description
• C. Column C - Class or Division
• D. Column D - Labels

Answer: (A)

UN numbers are the four-digit serial identifiers used worldwide to uniquely identify dangerous goods. In the DGR Table, that specific code is placed in the column labeled UN or ID Number. This number acts as a quick reference that links to all the safety details for the substance, such as its official shipping name, hazard class, and packing requirements. The other columns serve different roles: the Proper Shipping Name/Description shows the official name used on documents, the Class or Division indicates the hazard class, and the Labels column shows the required danger labels.