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प्रश्न
Give a brief account of the discovery of air and the scientists involved.
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उत्तर
- John Mayow (1674) proved air has two components – active and inactive components.
- Lavoisier (1789) named the active component as oxygen and inactive component as nitrogen
- Other scientists (1800's) discovered noble gases, \[\ce{CO2}\], water vapours.
संबंधित प्रश्न
Name two air pollutants which cause acid rain.
Name two air pollutants which cause global warming.
State four steps to be taken to control air pollution.
Tick (√) the correct alternative from the choice given for the following statement.
Air pollution is due to the
Tick (√) the correct alternative from the choice given for the following statement.
The gases which cause acid rain are
A mixture has a variable composition. Give three other reasons why air is considered a mixture and not a compound.
What is the importance of air in transmission of sound?
Explain the term ‘air pollution’, with reference to air quality. State the sources of a few main pollutants.
What is global warming?
Match the following:
| 1. | Layer of air | a. | Hand fan |
| 2. | Electrical energy | b. | 21% |
| 3. | Nitrogen | c. | Windmill |
| 4. | Oxygen | d. | Atmosphere |
| 5. | Palm Trees | e. | 78% |
