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प्रश्न
Fill in the blank:
Rusting is a chemical reaction which involves _____ oxidation.
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उत्तर
Rusting is a chemical reaction which involves slow oxidation.
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संबंधित प्रश्न
How is air useful to water boats?
Fill in the blank
Polluted air is harmful to ____.
Tick (√) the correct alternative from the choice given for the following statement.
Air pollution is due to the
Tick (√) the correct alternative from the choice given for the following statement.
Which of the following is not a greenhouse gas?
State whether the following statement is true or false.
The pressure exerted by air is called atmospheric pressure.
State the meaning of the term Air
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 |
Mention two advantages of wind energy.
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.
Why did the tiny bubbles appeared?
