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प्रश्न
Answer in your own words.
What are the various constituents of air? Write their uses.
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उत्तर
| Constituents of air | Uses |
| 1. Nitrogen | Required in building proteins. Useful in the production of ammonia. Used in airtight packaging of food products. |
| 2. Oxygen | Necessary for respiration and combustion. |
| 3. Carbon dioxide | Used by plants to make their food. Used in fire extinguishers. |
| 4. Argon | Used in electric bulbs. |
| 5. Helium |
Used for obtaining low temperatures. |
| 6. Neon | Used in decorative lights and street lighting. |
| 7. Krypton | Used in fluorescent tubes. |
| 8. Xenon | Used in flash photography. |
संबंधित प्रश्न
Write ‘True’ or ‘False’ in front of following statement.
Atmospheric nitrogen is directly absorbed by the plants to form plant proteins.
Tick (√) the correct alternative from the choice given for the following statement.
Air consists of
Tick (√) the correct alternative from the choice given for the following statement.
Respiration
Describe a simple experiment with the help of a diagram to show that Air is highly compressible
Fill in the blank:
Rusting is a chemical reaction which involves _____ oxidation.
Draw a neat labelled diagram for the following experiment.
To prepare oxygen in the laboratory from hydrogen peroxide and a catalyst.
Take a squeezable bottle. Make a hole on the lid and close the bottle tightly. Bring the bottle near your face and press the bottle. What do you feel?
The layer of air around the earth is known as ______.
In a number of musical instruments, air plays an important role. Can you name some such instruments?
Explain the following observations very briefly
A firki does not rotate in a closed area.
