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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 observeation balloons. | (b) Carbonic acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphuric acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
Name two important processes supported by oxygen present in air.
Give a brief account of the discovery of air and the scientists involved.
What is the importance of air in transmission of sound?
Fill in the blank:
Rusting is a chemical reaction which involves _____ oxidation.
Draw a neat labelled diagram for the following experiment.
To study the presence of carbon dioxide in air.
Mention two advantages of wind energy.
What is global warming?
Explain the following observations very briefly
The arrow of weather cock points towards a particular direction at a particular moment.
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.
