Which four materials are covered by RoHS?

Which four materials are covered by RoHS?

• A. Lead; Mercury; Cadmium; Arsenic
• B. Lead; Mercury; Cadmium; Zinc
• C. Lead; Mercury; Cadmium; Nickel
• D. Lead; Mercury; Cadmium; Chromium

Answer: (D)

RoHS restricts certain hazardous substances in electrical and electronic equipment to cut down environmental and health risks from discarded products. The four substances most commonly singled out are lead, mercury, cadmium, and chromium in its hexavalent form. These are targeted because they are highly toxic and have long-lasting effects in the environment, and they were widely used in electronics in the past: lead in solders, mercury in switches and relays, cadmium in batteries and pigments, and hexavalent chromium in protective coatings. So the set that RoHS regulates includes these four. The other metals listed in the distractors aren’t part of that four-substance group, even though they can be toxic in other contexts.

RoHS restricts certain hazardous substances in electrical and electronic equipment to cut down environmental and health risks from discarded products. The four substances most commonly singled out are lead, mercury, cadmium, and chromium in its hexavalent form. These are targeted because they are highly toxic and have long-lasting effects in the environment, and they were widely used in electronics in the past: lead in solders, mercury in switches and relays, cadmium in batteries and pigments, and hexavalent chromium in protective coatings. So the set that RoHS regulates includes these four. The other metals listed in the distractors aren’t part of that four-substance group, even though they can be toxic in other contexts.