Advertisements
Advertisements
Question
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.
Advertisements
Solution
No, the conclusion made by the student is wrong because the air from the upper gas jar also diffuses down into the lower gas jar containing bromine vapour. Since, air is colourless it cannot be noticed by the student.
APPEARS IN
RELATED QUESTIONS
Give reasons:
A gas fills completely the vessel in which it is kept.
Give reasons:
We can easily move our hand in air, but to do the same through a solid block of wood, we need a karate expert.
Give a reason for the following observation.
We can get the smell of perfume sitting several metres away.
If the fish is being fried in a neighbouring home, we can smell it sitting in our own home. Name the process which brings this smell to us.
When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance quickly spreads in the entire room. Name the process involved in this.
Explain how, the smell of food being cooked in the kitchen reaches us even from a considerable distance.
Explain why, diffusion occurs more quickly in a gas than in a liquid.
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:-
rigidity
