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प्रश्न
Explain Lavoisier’s experiment which provided evidence to the discovery of components in air.
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उत्तर
Lavoisier’s experiment for the discovery of oxygen. Set up in apparatus as shown in the figure. When mercury oxide is heated in the retort, oxygen is collected in bell jar.
Observation:
- A red layer was formed in the heated mercury surface in the retort.
- The level of mercury in the trough rose by 1/5.
Conclusion: The active part of air removed by mercury on heating was named ‘oxygen’.The remaining inactive part of air in the bell-jar was named nitrogen.
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संबंधित प्रश्न
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. |
(a) Oxygen |
| 2. A gas used for filling weather observation balloons. | (b) carbon acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphur acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
Give two uses of the following component present in air:
water vapour
Mention five causes of air pollution.
Describe a simple experiment with the help of a diagram to show that Air occupies space
Describe a simple experiment with the help of a diagram to show that Air exerts pressure
How is light scattered by the air?
Explain the term ‘air pollution’, with reference to air quality. State the sources of a few main pollutants.
Name a device which uses wind energy to generate electricity.
______ is important for all living creatures.
State whether the following statement is true or false. If false, correct them.
Air does not occupy any space.
