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| Q. |
Hydrogen is not found in atmosphere because – |
| A. | it is highly inflammable |
| B. | it is the lightest gas |
| C. | it is absorbed by plants |
| D. | it immediately combines with oxygen to form water |
| Answer» B. it is the lightest gas | |
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Explanation: Hydrogen is a chemical element with symbol H and atomic number 1. With an average atomic weight of 1.00794 u (1.007825 u for hydrogen-1), hydrogen is the lightest element and its monatomic form (H 1) is the most abundant chemical substance, constituting roughly 75% of the Universe's baryonic mass. Non-remnant stars are mainly composed of hydrogen in its plasma state. Air is the name given to the atmosphere used in breathing and photosynthesis. |
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