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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
Fill in the blank:
_____________ discovered the oxygen gas.
What do you observe when a beam of light is allowed to enter in a closed dark room through a small hole.
The capacity of air to hold moisture depends upon the ______ of the air.
Fill in the blank:
The gas evolved as a product of combustion as well as respiration is ______.
Air has variable composition and hence there is ______ oxygen at lower altitudes than at higher altitudes.
Draw a neat labelled diagram for the following experiment.
To prepare oxygen in the laboratory from hydrogen peroxide and a catalyst.
The composition of air is always exactly the same.
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% |
Wind does not help in the movement of which of the following?
Explain the following observations very briefly
The arrow of weather cock points towards a particular direction at a particular moment.
