Advertisements
Advertisements
प्रश्न
Answer in your own words.
What are the various constituents of air? Write their uses.
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 foods. Used in fire extinguishers. |
| 4. Argon | Used in electric bulbs. |
| 5. Heluim |
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
Name two air pollutants which cause acid rain.
Fill in the blank
Although we cannot see air, we can ___it.
Tick (√) the correct alternative from the choice given for the following statement.
Photosynthesis is a process in which plants
Tick (√) the correct alternative from the choice given for the following statement.
Respiration
What is meant by the term ‘atmosphere’? State the role played by the atmosphere for the survival of mankind.
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.
What should be done if the clothes of a person catch fire accidentally? Why?
About 78% of the volume of air is ______.
Make sentences using the given set of words.
Air, wind, motion, called
