Advertisements
Advertisements
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.
Advertisements
उत्तर
20.9%, oxygen is called active air because it supports life on earth. It is essential for the process of combustion.
APPEARS IN
संबंधित प्रश्न
Give word equation for the following conversion:
Nitrogen of the air to nitric oxide
Give word equation for the following conversion:
Nitric acid to soluble nitrates in the soil
State four different properties of a compound and a mixture.
Mention one necessary condition for the combustion to take place.
Soda bottle bursts sometimes when it is opened during summer. Why?
Nitrogen gas is so cold that moisture in the air condenses on it, creating a dense fog.
Mountaineers carry oxygen cylinders with them because ______.
State whether the following statement is true or false. If false, correct them.
Plants produce oxygen during the process of making their own food.
Observe the picture given in Fig. carefully and answer the following questions.
Why is he putting a cover on his nose?
Explain the following observations very briefly
Breathing through mouth may harm you.
