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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
What are the main components of air?
Give reason:
When water is heated, we see bubbles rising up.
With the help of a labeled diagram, describe a simple experiment to show the presence of oxygen and nitrogen in air using a piece of white phosphorus.
Name the following:
The component of air which is present more in industrial areas.
Why is carbon-dioxide gas used to extinguish fire?
______ present in the air is needed for respiration.
What is the presence of harmful substance in the air called?
______ gas cylinders are used for breathing purpose for a diver going deep into the sea.
______ gas is essential for the proper growth of all plants.
State whether the following statement is true or false. If false, correct them.
Plants produce oxygen during the process of making their own food.
