Advertisements
Advertisements
Question
Name the components of air with their approximate percentage by volume in air. Does the percentage by volume of each component remain the same, in the atmosphere of different parts of the world? Explain with reasons.
Advertisements
Solution
The main components of the air are :
- Nitrogen
- Oxygen
Composition of air by volume:
Nitrogen: 78% or 4/5 th
Oxygen: 21% or 1/5 th
Carbon dioxide: 0.03 - 0.04%
Inert gases: 0.9%
[Water vapours, dust particles, other impurities]: variable
OR
| Gases | Percentage | Figure |
| Nitrogen | 78% |  |
| Oxygen | 21% | |
| Carbon dioxide | 0.03 - 0.04% | |
| Inert gases | 0.9% | |
| Water vapour | Varies | |
| Dust particles | Varies | |
| Other impurities | Varies |
Air is a mixture whose composition varies at different intervals of time and different places of the world.
RELATED QUESTIONS
Complete and balance the following chemical equation.
\[\ce{HgO ->[heat]}\] ______ + _______
What do you understand by the term polluted air?
Name and briefly explain four ways by which pollution of air is caused by humans.
What do you observe when Ice cold water is filled in a glass tumbler.
Give a reason why two different rare (inert) gases find application in advertisement signs and fluorescent bulbs.
Match the statements in List 1 with the correct answers in List 2
| List 1 | List 2 | ||
| 1 | An impurity in air | A | Water vapour |
| 2 | The component of air which supports combustion | B | Respiration |
| 3 | The inert component in the air slightly soluble in water | C | Rare gases |
| 4 | The component of air which minimizes the rate of evaporation | D | Sulphur dioxide |
| 5 | The process which involves oxidation of food substance in living organisms | E | Helium |
| 6 | The component of air which finds application in observation balloons | F | Carbon dioxide |
| 7 | The process which involves oxidation of substances, liberating heat and light energy | G | Combustion |
| 8 | The component of air which is heavier than air and fairly soluble in water | H | Nitrogen |
| 9 | The process by which atmospheric carbon dioxide is absorbed by plants resulting in the formation of carbohydrates | I | Photosynthesis |
| 10 | The component of air which is lighter than air and less than 1% in air | J | Oxygen |
Name the main component of air.
Classify the following.
( Dog, Cat, coconut tree, monkey, brinjal plant, papaya plant)
| Things which give out oxygen | Things which give out carbon dioxide |
Which gas in the atmosphere is essential for respiration?
The component of air used by green plants to make their food, is ______.
