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प्रश्न
Explain the following observations very briefly
Breathing through mouth may harm you.
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उत्तर
There are many dust particles, gases and water vapours present in the air that we breathe. When we inhale through nostrils, the entry of these harmful particles is prevented by the fine hair and mucus present in the nose as they filter the air but when we breathe through the mouth there’s no such filtering of particles. Thus, they enter our body, reach the respiratory tract and make us ill.
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संबंधित प्रश्न
Briefly state the importance of Nitrogen.
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.
Name the following:
The main, rare (inert) gas present in air.
Name the following:
An inert gas which has a low boiling point and is used for producing very low temperatures
Compare respiration and combustion-both involving oxygen of the air.
Explain carbon dioxide and its uses.
How to show the presence of carbon-di-oxide in the air?
Give the components present in the air with a percentage?
Tri oxygen molecule is known as ______.
Match the following
| 1. | Nitrogen | a. | Acid rain |
| 2. | CO2 | b. | Global warming |
| 3. | Melting of glaciers | c. | Volcanic gases |
| 4. | Corrosion of bridges | d. | Aerated drinks |
