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प्रश्न
Define rusting?
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उत्तर
Rusting: Slow conversion of iron into its hydrated oxide in the presence of moisture and air is called rusting.
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संबंधित प्रश्न
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 |
How is air useful to windmills?
Tick (√) the correct alternative from the choice given for the following statement.
Which of the following is not a greenhouse gas?
Give a brief account of the discovery of air and the scientists involved.
What is meant by the term ‘atmosphere’? State the role played by the atmosphere for the survival of mankind.
State whether the following statement is true or false.
The pressure exerted by air is called atmospheric pressure.
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 |
Air has no ______ & ______.
Wind does not help in the movement of which of the following?
Explain the following observations very briefly
A firki does not rotate in a closed area.
