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प्रश्न
Give the chemical name of rust.
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उत्तर
The chemical name of rust is hydrated iron oxide [Fe2OrxH2O]
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संबंधित प्रश्न
Answer the question put against the following constituents of air :
Oxygen : What is the percentage proportion of oxygen in air ? Why is oxygen called active air.
Define the term Global warming.
Statement given below is incorrect. Write the correct statement :
Helium gas at low pressure is used for filling electric bulbs.
Explain the importance of nitrogen of the air for plant growth.
Name the following:
The active component of air which supports combustion and is used up in burning
Mention one necessary condition for the combustion to take place.
Air is made up of oxygen only.
Match the following.
| Nitrogen | Respiration in living animals |
| Oxygen | Fertilizer |
| Carbon dioxide | Refrigerator |
| Dry ice | Fire extinguisher |
The amount of water vapour in the air is more in windy places than in other areas.
______ exists in nature as silicates, carbonates, oxides, and water. It also exists in a free state as part of the air in the atmosphere.
