Advertisements
Advertisements
Question
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
Solution
20.9%, oxygen is called active air because it supports life on earth. It is essential for the process of combustion.
APPEARS IN
RELATED QUESTIONS
What is the significance of water vapour in air?
Fill in the blanks
Plants and animals maintain the balance of carbon ___________and _________ in the air.
Write ‘true’ or ‘false for the following;
The composition of air was discovered by Lavoisier.
Name three different appliances where air is utilized.
Name the following:
An inert gas which has a low boiling point and is used for producing very low temperatures
Match the following.
| Nitrogen | Respiration in living animals |
| Oxygen | Fertilizer |
| Carbon dioxide | Refrigerator |
| Dry ice | Fire extinguisher |
Composition of the component of air ______ from place to place.
Match the following:
| 1. | More industrial cities | a. | dust particles |
| 2. | Coastal areas | b. | Humidity |
| 3. | Rainy season | c. | Carbon dioxide |
| 4. | Windy places | d. | water vapour |
“Air is not an elementary substance, but a composition”. Why?
Nitrogen is an essential element present in proteins and nucleic acids which are the building blocks of living things.
