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| Q. |
Which of the following is not a noble gas? |
| A. | Hydrogen |
| B. | Helium |
| C. | Neon |
| D. | Argon |
| Answer» A. Hydrogen | |
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Explanation: The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon. |
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