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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.
Tabulate the differences in the characteristics of states of matter.
Give reasons:
A gas fills completely the vessel in which it is kept.
A bottle of perfume was opened in a room. The smell of its vapours spread in the entire room. Name the property of gases which is responsible for this behaviour of perfume vapours.
Name the three states of matter. Give one example of each.
State two characteristic properties of a gas.
Why does a gas fill a vessel completely?
Why do gases not have fixed shape?
Comment upon the following:-
density
A gaseous mixture of He and O2 is found to have a density of 0.518 gL-1 at 25° C and 720 torr. The mass percent of helium in this mixture is ______.
