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प्रश्न
Explain the following observations very briefly
An empty glass in fact is not empty.
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उत्तर
In an empty glass there is always air present which covers up the space therefore, it cannot be said empty. Air is transparent, weightless and doesn’t have a definite shape or volume, thus, we cannot see it.
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संबंधित प्रश्न
Explain the conversion of nitrogen into nitrates during lightning.
Write fully balanced equation for the following :
CO2 + H2O →
Give a reason why two different rare (inert) gases find application in advertisement signs and fluorescent bulbs.
State a reason why there is a balance in the amount of carbon dioxide in the air, even though carbon dioxide is released into the atmopshere by various processes.
Name three different appliances where air is utilized.
Complete the statement given below by filling in the blank with the correct word from the words given:
The product formed which is common to both combustion and respiration is ______.
Why is air considered as a mixture?
What happens if the percentage of oxygen in the air reaches to 70%?
_______ and ______ are the two gases, which when taken together, make up about 99 percentage of air.
- Nitrogen
- carbon-di-oxide
- Noble gases
- Oxygen
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.
