Question

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 pf some heavy metals into the environment.

3. They may release sulphur dioxide as a pollutant.

Select the correct answer using the code given below:

(a) 1 and 2 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

Answer 1

Correct option is (b) 2 and 3 only

• Arsenic a heavy metal is associated with copper, iron and silver ores. → #2 may be right.
• Smelting of metals produce sulphur dioxide → #2 may be right.
• I was unable to find Reliable source to validate #1 so it may be wrong.