Advertisements
Advertisements
प्रश्न
Answer in your own words.
What are the various constituents of air? Write their uses.
Advertisements
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
What do you observe when a burning candle is covered with an inverted jar.
Write the chemical name of The white insoluble solid formed on the reaction of carbon dioxide with lime water.
Tick (√) the correct alternative from the choice given for the following statement.
Rust is
Tick (√) the correct alternative from the choice given for the following statement.
Photosynthesis is a process in which plants
Name the following.
Inert gases in the air
Explain the term ‘air pollution’, with reference to air quality. State the sources of a few main pollutants.
Mention two advantages of wind energy.
What should be done if the clothes of a person catch fire accidentally? Why?
What is global warming?
Match the items of Column I with the items of Column II
| Column I | Column II | ||
| (a) | Weather cock | (i) | Gases and fine dust particles |
| (b) | Mountaineers | (ii) | Sailing yacht |
| (c) | Fine hair inside the nose | (iii) | Oxygen cylinders |
| (d) | Smoke | (iv) | Direction of air flow |
| (e) | Wind | (v) | Prevent dust particles |
