MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
| 1. |
Which air pollutant cause corrosion of building? |
| A. | SO<sub>2</sub> |
| B. | SO<sub>3</sub> |
| C. | CO |
| D. | NO<sub>2</sub> |
| Answer» B. SO<sub>3</sub> | |