MCQOPTIONS
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MCQOPTIONS
| 1. |
Chief air pollutant in big metropolitan city like Kolkata and Mumbai |
| A. | CO and SO |
| B. | <sub>2</sub> |
| C. | Hydrocarbon |
| D. | Spores of algae |
| E. | Ozone |
| Answer» B. <sub>2</sub> | |