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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
Fill in the blank space by choosing the correct word from the given list.
List: oxygen, carbonic, suIphurUioxide gas, precipitation, helium
Solution of carbon dioxide in water is called _________ acid.
Write ‘True’ or ‘False’ in front of following statement.
The catalyst used in laboratory preparation of oxygen gas from hydrogen peroxide gas is magnesium oxide
Write ‘true’ or ‘false for the following;
The composition of air was discovered by Lavoisier.
Tabulate the various components of air, including the components with variable composition.
How do the roots of land plants get oxygen for breathing?
Match the following.
| Nitrogen | Respiration in living animals |
| Oxygen | Fertilizer |
| Carbon dioxide | Refrigerator |
| Dry ice | Fire extinguisher |
How will you prove that air supports burning?
The composition of air changes slightly from place to place. Give examples.
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 |
State whether the following statement is true or false. If false, correct them.
Plants consume oxygen for respiration.
