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UPSC PYQPrelims 2021

Civil Services Examination · Question 17

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 code given below.

  1. 1 and 2 only
  2. 2 and 3 only
  3. 1 and 3 only
  4. 1, 2 and 3
Show answer & explanation

Answer: (B) 2 and 3 only

Explanation

Copper smelting (sulphide ores) releases SO2, and slag can leach heavy metals (e.g., the Sterlite Tuticorin controversy). Lethal CO emission is not a characteristic concern.