Final answer:
There are nine hazard classes of dangerous goods, ranging from explosives to miscellaneous dangerous goods. These classes detail the risks associated with the transportation and handling of different hazardous materials.
Step-by-step explanation:
There are nine hazard classes of dangerous goods. These classes are defined and regulated in international guidelines, such as those by the International Air Transport Association (IATA) and the United Nations. Each class represents different types of risks associated with the transportation and handling of the materials.
The nine hazard classes are as follows:
- Class 1: Explosives
- Class 2: Gases
- Class 3: Flammable Liquids
- Class 4: Flammable Solids
- Class 5: Oxidizing Substances and Organic Peroxides
- Class 6: Toxic and Infectious Substances
- Class 7: Radioactive Material
- Class 8: Corrosive Substances
- Class 9: Miscellaneous Dangerous Goods
Therefore, the correct answer to the question is d) 9.