Question

a student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromine vapour . 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 vapours which moves up and diffuses into air in the upper jar , the air from upper jar doesnt move down by diffusion into the lower jar containing bromine vapours . do you agree with this conclusion from student ? give reasons for your answers

Answer 1

Answer: The given conclusion is false.

Explanation:

It is known that in a gas, particles are held together by weak intermolecular forces which are Vander waal forces. Hence, molecules of a gas are able to flow easily from one place to another due to high kinetic energy and more number of collisions.

As a result, gases have the property to diffuse at a faster rate.

So, when a jar filled with air if placed over a jar filled with red-brown bromine vapors then both air and bromine gas will mix with each other. Due to this bromine will diffuse into the air and air will diffuse into the jar containing bromine vapors.

Hence, conclusion of the student that air will not move downwards from its position is false.

Answer 2

Answer:

No, the student's conclusion is wrong. The air from upper gas jar also diffuses down into the lower gas jar containing bromine vapour. But since air is colourless, it cannot be noticed by the student

Hope it will help you....