Which of the following pollutes the air of big cities?

  1. Copper
  2. Lead
  3. Chromium
  4. Copper Oxide
Anurag Mishra Professor Asked on 23rd January 2016 in Environment Science.
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  • 1 Answer(s)

    Answer:  (2) Lead 

    Anurag Mishra Professor Answered on 23rd January 2016.
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