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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
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.
Describe a simple experiment to show that l/5th of air is oxygen.
Tick (√) the most appropriate answer.
A gas which dilutes the activity of oxygen in air is:
Give reason:
A burning candle stops burning if covered with a glass tumbler
Fill in the blank
Green plants need ________________to prepare food.
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
The percentage of carbon dioxide in the air is between 0.2 to 0.4%.
Air is made up of oxygen only.
Can you guess why fire extinguishers throw a stream of carbon-di-oxide while putting - off the fire?
Write a note on nitrogen.
Explain the following observations very briefly
An empty glass in fact is not empty.
