Final answer:
Cadmium is classified as a probable human carcinogen and is commonly used in NiCd batteries. It can cause respiratory and kidney problems when inhaled, and immediate poisoning when ingested. The classification implies the potential for cadmium to cause cancer in humans.
Step-by-step explanation:
In 1992, the Environmental Protection Agency (EPA) classified cadmium as a Group B1 probable human carcinogen. This means that there is substantial evidence to suggest that cadmium can cause cancer in humans. Cadmium is commonly used with nickel in NiCd (nickel-cadmium) batteries.
Cadmium is a toxic heavy metal that can have harmful effects on the human body. Inhalation of cadmium-laden dust can lead to respiratory tract and kidney problems, while ingestion of significant amounts can cause immediate poisoning and damage to the liver, bones, and kidneys.
The EPA classification of cadmium as a probable human carcinogen in 1992 implies that cadmium has the potential to cause cancer in humans, particularly when used in batteries or in combination with other metals like nickel.