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प्रश्न
Name the important scientists and their studies which led to the discovery of the components of air.
उत्तर
Discovery of air:
- John Mayow (1674) proved air has two components – active and inactive components.
- Lavoisier (1789) named active component as oxygen and inactive component as nitrogen
- Other scientists (1800’s) discovered noble gases, C02, water vapours.
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संबंधित प्रश्न
Mention the contribution of the following scientists :
- Antoine Lavoisier
- Robert Boyle
- Joseph Priestley
- Sir W. Ramsay
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. |
(a) Oxygen |
| 2. A gas used for filling weather observation balloons. | (b) carbon acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphur acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
What is wind?
Mention five causes of air pollution.
Fill in the blank
Although we cannot see air, we can ___it.
Fill in the blank
Polluted air is harmful to ____.
Tick (√) the correct alternative from the choice given for the following statement.
Fuels which do not leave any residue on burning are
Tick (√) the correct alternative from the choice given for the following statement.
The substance which accelerates the speed of a reaction without itself undergoing any change is called
Fill in the blank:
Rusting is a chemical reaction which involves _____ oxidation.
A list of words is given in a box. Use appropriate words to fill up the blank in the following statement
Air is a ______ of some gases.
