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प्रश्न
Give reason for the following:
Helium replaced hydrogen in weather observation balloons?
उत्तर
If there is small leakage of hydrogen in a balloon, it forms a mixture with air that can explode. So helium has replaced hydrogen.
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संबंधित प्रश्न
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A pop sound produced when hydrogen is burnt?
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Hydrogen is present abundantly in the ................
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The gas which has now replaced hydrogen in air balloons is ___.
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| List I | List II |
| 1. An atom of hydrogen | A: Chromic oxide |
| 2. A strong oxidising agent | B: Ammonia |
| 3. A promoter used in Bosch process | C: Iron |
| 4. A chemical used in the manufavture of fertilizers | D: One electron |
| 5. The catalyst used in production of a basic gas from nitrogen. | E: Dilute nitric acid |
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When steam is passed over red hot iron.
Select the correct answer from the symbol in the bracket.
The element, which like hydrogen has one valence electron.
