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प्रश्न
Explain Lavoisier’s experiment which provided evidence to the discovery of components in air.
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 observeation balloons. | (b) Carbonic acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphuric acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
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How is air useful to agriculture?
What is meant by ozone depletion?
Fill in the blank
Air is a ______ of gases
State whether the following statement is true or false.
The pressure exerted by air is called atmospheric pressure.
Name a device which uses wind energy to generate electricity.
The composition of air is always exactly the same.
Wind does not help in the movement of which of the following?
Make sentences using the given set of words.
Air, wind, motion, called
