UPSC CSE Prelims
Question 76
Why is there a concern about copper smelting plants?
- They may release lethal quantities of carbon monoxide into environment.
- The copper slag can cause the leaching of some heavy metals into environment.
- They may release sulphur dioxide as a pollutant.
Select the correct answer using the code given below.
View correct answer and explanation
Correct answer: B
Correct Option: B (2 and 3 only)
Explanation: Copper smelters can leave heavy-metal-bearing slag and emit sulphur dioxide from sulphide-ore processing. Carbon monoxide is not the principal pollutant singled out in this context.
Statement / Pair / Item-wise Analysis:
1. Incorrect / does not qualify - Copper smelting is not characteristically described as releasing lethal carbon-monoxide quantities; this overstates the concern.
2. Correct / qualifies - Discarded smelter slag can leach toxic metals into soil and water.
3. Correct / qualifies - Roasting/smelting sulphide ores can release substantial SO2 air pollution.
Option-wise Analysis:
A. Incorrect-includes item 1, which is not valid (Copper smelting is not characteristically described as releasing lethal carbon-monoxide quantities; this overstates the concern); omits valid item 3 (Roasting/smelting sulphide ores can release substantial SO2 air pollution).
B. Correct-selects exactly the supported statements/items: 2, 3.
C. Incorrect-includes item 1, which is not valid (Copper smelting is not characteristically described as releasing lethal carbon-monoxide quantities; this overstates the concern); omits valid item 2 (Discarded smelter slag can leach toxic metals into soil and water).
D. Incorrect-includes item 1, which is not valid (Copper smelting is not characteristically described as releasing lethal carbon-monoxide quantities; this overstates the concern).