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 pollu

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Q: (IAS/2021)
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. I
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question_subject: 

Ecology

question_exam: 

IAS

stats: 

0,114,218,18,114,18,182

keywords: 

{'copper slag': [0, 0, 0, 1], 'copper': [1, 0, 1, 1], 'carbon monoxide': [3, 0, 1, 1], 'sulphur dioxide': [0, 0, 0, 1], 'leaching': [1, 0, 0, 2], 'pollutant': [1, 0, 0, 1], 'heavy metals': [1, 0, 0, 0], 'plants': [11, 0, 4, 4], 'lethal quantities': [0, 0, 0, 1]}