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प्रश्न
Why is it said that-
Air is a homogeneous mixture of various gases.
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उत्तर
In the case of air, the majority of it contains nitrogen and oxygen. These gases cannot be readily differentiated from one another, and the air has a uniform composition of these gases throughout. Hence it is a homogenous mixture of various gases.
संबंधित प्रश्न
Discuss harmful effects of greenhouse effect.
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. |
(a) Oxygen |
| 2. A gas used for filling weather observation balloons. | (b) carbon acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphur acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
State two similarities and two differences between respiration and burning.
Tick (√) the correct alternative from the choice given for the following statement.
Photosynthesis is a process in which plants
State what do you understand by the term ‘air’. Explain its importance to mankind.
Name the following.
Inert gases in the air
State whether the following statement is true or false.
The pressure exerted by air is called atmospheric pressure.
Explain the term ‘air pollution’, with reference to air quality. State the sources of a few main pollutants.
Match the statements in List I with the correct answer from List II.
| List I | List II |
| 1. The constituent of air which is around 0.02% | A: Nitrogen |
| 2. The constituent of air which is inert or unreactive | B: Oxygen |
| 3. The constituent of air which is non-combustible, but supports combustion. |
C: Sulphur dioxide |
| 4. A pollutant in air responsible for acid rain | D: Carbon dioxide |
| 5. The main rare gas present in air. | E: Argon |
Fill in the blank:
Rusting is a chemical reaction which involves _____ oxidation.
