Final answer:
Special disposal receptacles are needed for chemicals remaining after chemotherapy treatments and used bandages, since these are hazardous and biomedical wastes, respectively.
Step-by-step explanation:
The special disposal receptacles are required for a) chemicals remaining after chemotherapy treatments, which are considered hazardous waste, and b) used bandages, which are categorized as biomedical waste. The waste generated from health care activities, including the mentioned chemotherapy chemicals and bandages, contains potentially infectious and harmful materials that can affect health and the environment, thus requiring specialized disposal methods. Moreover, it is important to note that expired pharmaceutical drugs should also be disposed of carefully to avoid environmental pollution.