iAspirantsUPSC Prelims 2021 Question 95 of 100
2021Environment and Ecology
Q77. Why is there a concern about copper smelting plants? (1) They may release lethal quantities of carbon monoxide into the environment. (2) The copper slag can cause the leaching of some heavy metals into the environment. (3) They may release sulphur dioxide as a pollutant.
Select the correct answer using the code given below: