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प्रश्न
Name two gases of air which dissolve in water by diffusion. What is the importance of this process in nature?
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उत्तर
The gases which dissolve in water by diffusion are carbon dioxide and oxygen. Carbon dioxide dissolved in water bodies is essential for the survival of the aquatic plants as they use this carbon dioxide to make food by photosynthesis. Oxygen dissolved in water is used by aquatic animals for breathing.
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संबंधित प्रश्न
The mass per unit volume of a substance is called density.
(density = mass/volume).
Arrange the following in order of increasing density-
air, exhaust from chimneys, honey, water, chalk, cotton and iron.
Give reasons:
A gas exerts pressure on the walls of the container.
Give a reason for the following observation.
We can get the smell of perfume sitting several metres away.
Which of the two diffuses faster : a liquid or a gas?
Which of the following diffuses fastest and which the slowest?
Solid, Liquid, Gas Give reasons for your answer.
Why do gases diffuse very fast?
Why does a gas fill a vessel completely?
Look at the diagram on the right side. Jar A contains a red-brown gas whereas jar B contains a colourless gas. The two gas jars are separated by a galas plate placed between them
- What will happen when the glass plate between the two jars is pulled away?
- What name is given to the phenomenon which takes place?
- Name the brown gas which could be in jar A.
- Which is the colourless gas most likely to be present in jar B?
- Name one coloured solid and one colourless liquid which can show the same phenomenon.
Comment upon the following:-
kinetic energy
Explain why?
- A gas fills a vessel completely?
- Camphor disappears without leaving any residue.
