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| Q. |
The gas used to dilute oxygen for breathing by deep sea divers is- |
| A. | Neon |
| B. | Argon |
| C. | Nitrogen |
| D. | Helium |
| Answer» D. Helium | |
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Explanation: Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired). |
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