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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
Mention the contribution of the following scientists :
- Antoine Lavoisier
- Robert Boyle
- Joseph Priestley
- Sir W. Ramsay
Name two important processes supported by oxygen present in air.
How is air useful to windmills?
A mixture has a variable composition. Give three other reasons why air is considered a mixture and not a compound.
Answer in your own words.
What are the various constituents of air? Write their uses.
What is wind energy?
Take a squeezable bottle. Make a hole on the lid and close the bottle tightly. Bring the bottle near your face and press the bottle. What do you feel?
Cool and soothing wind: Breeze.
uproot trees wind: ______.
Explain the following observations very briefly
A firki does not rotate in a closed area.
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Why did the tiny bubbles appeared?
