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प्रश्न
Explain why, when a bottle of perfume is opened in a room, we can smell it even from a considerable distance.
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उत्तर
When a bottle of perfume is opened in a room, the particles of perfume, start diffusing into the air surrounding the bottle. These particles of perfume keep moving towards a region of lower concentration by the virtue of their kinetic energy. Thus, when a bottle of perfume is opened, we can smell perfume even from a distance.
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संबंधित प्रश्न
Comment upon the following:
rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density.
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.
Name two gases which are supplied in compressed form in homes and hospitals.
Why does a gas fill a vessel completely?
A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromine vapours. He observed that the red-brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it is only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student? Give reason for your answer.
The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume. If, however, the substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume.
- Name the substances (i) X (ii) Y and (iii) Z.
- What is the process of conversion of X into Y known as ?
- At which temperature X gets converted into Y ?
- What is the process of conversion of X into Z known as ?
- At which temperature X gets converted into Z ?
The space between ______ particles is the greatest one.
Which of the following is false for gases?
2 litre He gas at 2 atm and 300 K is inserted into a 4 litre rigid container containing N2 at 600 K and 4 atm. Finally mixture is maintained at 600 K temperature. The final pressure of gaseous mixture would be ______ torr.
