MCQOPTIONS
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MCQOPTIONS
| 1. |
Which of the following molecule doesn t exist? |
| A. | O<sub>2</sub> |
| B. | H<sub>2</sub> |
| C. | He<sub>2</sub> |
| D. | N<sub>2</sub> |
| Answer» C. He<sub>2</sub> | |