MCQOPTIONS
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MCQOPTIONS
| 1. |
Which_of_the_following_is_known_as_laughing_gas?$ |
| A. | CO<sub>2</sub> |
| B. | N<sub>2</sub>O |
| C. | NO<sub>2</sub> |
| D. | B<sub>2</sub>O |
| Answer» C. NO<sub>2</sub> | |