Chemistry
What are the main components of air ? Write down the composition of the three main gases present in air by volume.
Answer
The main gases present in air are nitrogen and oxygen. Besides these two gases, air also contains small quantities of carbon dioxide, water vapour, dust particles and traces of inert gases like helium, neon, argon, etc. Air also contains smoke as a pollutant.
| Gases | Percentage |
|---|---|
| Nitrogen | 78% |
| Oxygen | 21% |
| Carbon dioxide | 0.03-0.04% |
Related Questions
What do you observe when
(a) Ice cold water is filled in a glass tumbler.
(b) A burning candle is covered with an inverted jar.
(c) Carbon dioxide gas is passed through lime water.
(d) A beam of light is allowed to enter in a closed dark room through a small hole.
Why is air called a mixture ? Give five facts in support of your answer.
Rust is:
- hydrated iron oxide
- hydrated copper sulphate
- anhydrous iron oxide
- none of the above
Photosynthesis is a process in which plants:
- take in oxygen and give out carbon dioxide
- take in carbon dioxide and give out oxygen
- take in nitrogen and give out oxygen.
- none of the above