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प्रश्न
With the help of a labeled diagram, describe a simple experiment to show the presence of oxygen and nitrogen in air using a piece of white phosphorus.
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उत्तर
Activity to show the presence of oxygen and nitrogen in the air using a piece of white phosphorous
1. A trough is taken and filled with water
2. Over it is placed a bell-jar marked with five equal parts.
3. A crucible containing white phosphorus is placed on a cork
4. The cork is made to float on the water.
5. A heated iron rod is them taken.
6. The phosphorus is ignited with the heated rod.
Observations:
Dense white fumes of phosphorus pentoxide (P2O5) are formed when the phosphorus (P) burns in the active component of air (oxygen).
The rise in the level of water in the bell-jar is by 1/5
Conclusion:
|
Oxygen (active compound) |
1/5 (approx volume) | Supports combustion | Used up in burning |
|
Nitrogen (In active component bell - jar) |
4/5 (approx volume) | Does not support combustion | Remains behind in the combustion |
The active component of air i.e. oxygen (1/5 of air) is used up in burning. The remaining inactive component of air i.e. nitrogen (4/ 5 of air) is not used up in burning.
संबंधित प्रश्न
You are given a test tube with two outlets and a bottle of lime water. Using same, how would you demonstrate experimentally the presence of carbon dioxide in air.
Name three different appliances where air is utilized.
Name the following:
An inert gas which has a low boiling point and is used for producing very low temperatures
Give word equation for the following conversion:
Nitrogen dioxide to nitric acid
______ gas is given to the patients having breathing problems.
The balance of oxygen in atmosphere is maintained through photosynthesis in animals and respiration in plants.
Match the following
| 1. | Moving Air | Photosynthesis |
| 2. | Layer in which we live | Troposphere |
| 3. | Stratosphere | Wind |
| 4. | Oxygen | Ozone layer |
| 5. | carbon-di-oxide | Combustion |
Arrange the following statements in correct sequence
- Plants manufacture food by a process called photosynthesis.
- Plants require energy for their growth.
- Plants take in oxygen and release carbon dioxide just as animals.
- Plants take carbon dioxide from the atmosphere, use chlorophyll in the presence of sunlight and prepare food.
- Such oxygen is available to animals and human beings for breathing.
- During this process, oxygen is released by plants.
The Scottish chemist ______ discovered carbon dioxide is present in air.
Explain carbon dioxide and its uses.
