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प्रश्न
The process of conversion of iron into hydrated form of oxides is called _______.
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उत्तर
The process of conversion of iron into hydrated form of oxides is called rusting.
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संबंधित प्रश्न
Fill in the blank:
_____________ discovered the oxygen gas.
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 |
Name the processes which maintain the balance between oxygen and carbon dioxide in the air. How is it done?
How is air useful to windmills?
Name two air pollutants which affect our health.
Name two air pollutants which cause global warming.
State whether the following statement is true or false.
The pressure exerted by air is called atmospheric pressure.
The layer of air around the earth is known as ______.
Match the items of Column I with the items of Column II
| Column I | Column II | ||
| (a) | Weather cock | (i) | Gases and fine dust particles |
| (b) | Mountaineers | (ii) | Sailing yacht |
| (c) | Fine hair inside the nose | (iii) | Oxygen cylinders |
| (d) | Smoke | (iv) | Direction of air flow |
| (e) | Wind | (v) | Prevent dust particles |
Explain the following observations very briefly
The arrow of weather cock points towards a particular direction at a particular moment.
