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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 following :
| Column A | Column B |
| (a) Global warming | 1. Hydrated ferric oxide |
| (b) Acid rain | 2. Manganese dioxide |
| (c) Rust | 3. Carbon dioxide |
| (d) Catalyst | 4. Methane |
| (e) Photosynthesis | 5. Nitrogen Dioxide |
What do you observe when a beam of light is allowed to enter in a closed dark room through a small hole.
Give two uses of the following component present in air:
oxygen
Give two uses of the following component present in air:
carbon dioxide
Define the following:
Respiration
Tick (√) the correct alternative from the choice given for the following statement.
Respiration
While freezing, the ______ of water is lowered.
Water does not have a ______ but has definite ______ and ______.
Why is it said that-
Air is a homogeneous mixture of various gases.
State whether the following statement is true or false.
The pressure exerted by air is called atmospheric pressure.
