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प्रश्न
What are the two necessary conditions for rusting of iron?
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उत्तर
Conditions for rusting:
- Presence of moisture (water).
- Presence of oxygen (air).
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संबंधित प्रश्न
Define the term Global warming.
Write ‘True’ or ‘False’ in front of following statement.
Enamelling is the process of baking a mixture of silicates on the surface of aluminium at a high temperature.
Match the statements in List 1 with the correct answers in List 2
| List 1 | List 2 | ||
| 1 | An impurity in air | A | Water vapour |
| 2 | The component of air which supports combustion | B | Respiration |
| 3 | The inert component in the air slightly soluble in water | C | Rare gases |
| 4 | The component of air which minimizes the rate of evaporation | D | Sulphur dioxide |
| 5 | The process which involves oxidation of food substance in living organisms | E | Helium |
| 6 | The component of air which finds application in observation balloons | F | Carbon dioxide |
| 7 | The process which involves oxidation of substances, liberating heat and light energy | G | Combustion |
| 8 | The component of air which is heavier than air and fairly soluble in water | H | Nitrogen |
| 9 | The process by which atmospheric carbon dioxide is absorbed by plants resulting in the formation of carbohydrates | I | Photosynthesis |
| 10 | The component of air which is lighter than air and less than 1% in air | J | Oxygen |
Complete the statement given below by filling in the blank with the correct word from the words given
___________is an example of a pollutant present in the air.
How do plants and animals maintain the balance of oxygen and carbon dioxide in the air?
Which gas is essential for burning?
What was the old name of nitrogen?
During respiration, carbon-di-oxide is exhaled out of the body through the ______.
Air also contains a small amount of carbon-di-oxide, water vapour, and some other gases like argon,
“Air is not an elementary substance, but a composition”. Why?
