Why is there a concern about copper smelting plants? 1. They may release lethal quantities of carbon monoxide into environment. 2. The copper slag can cause the leaching of some heavy metals into environment. 3. They may release sulphur dioxide as a pollutant. Select the correct answer using the codes given below.
Explanation
Statement 1 is Incorrect: Copper smelting plants are not typically associated with the release of lethal quantities of carbon monoxide into the environment; the primary gaseous pollutant of concern is sulfur dioxide. Statement 2 is Correct: Copper slag is a byproduct of the smelting process that contains heavy metals such as arsenic, lead, and cadmium. These metals can leach into the environment, potentially contaminating soil and groundwater resources. Statement 3 is Correct: Copper smelting plants are a major source of sulfur dioxide (SO2) emissions. This occurs because most copper ores are sulfide minerals (like chalcopyrite), and the sulfur within the ore is oxidized and released as SO2 gas during the roasting and smelting processes.