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प्रश्न
Give a reason for the following observation.
Naphthalene balls disappear with time without leaving any solid.
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उत्तर
- Naphthalene undergoes sublimation easily, i.e., the change of state from solid to gas takes place easily.
- Thus, naphthalene balls disappear with time without leaving any solid.
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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.
Name the physical state of matter which can be easily compressed.
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.
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.
Comment upon the following:-
rigidity
Which of the following is TRUE about gaseous state?
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| Fig. I | Fig. II |
In figure-I, an air column of length ℓ1 is entrapped by a column of Hg of length 8 cm. In figure-II length of same air column at the same temperature is ℓ2. The `ℓ_1/ℓ_2` is:
(1 atm = 76 cm of Hg)
