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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.
Arrange the following substances in increasing order of forces of attraction between particles -
water, sugar, oxygen
Name the physical state of matter which can be easily compressed.
Name two gases which are supplied in compressed form in homes and hospitals.
State whether the following statement is true or false :
Red-brown bromine vapour diffuse into air in a gas jar but the colourless air molecules do not diffuse into bromine vapour.
Explain how, the smell of food being cooked in the kitchen reaches us even from a considerable distance.
Explain why, when a bottle of perfume is opened in a room, we can smell it even from a considerable distance.
A substance has neither a fixed shape nor a fixed volume. State whether it is a solid, a liquid or a gas.
Explain why?
- A gas fills a vessel completely?
- Camphor disappears without leaving any residue.
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 ______.
