Give reasons:​

(g) When an empty gas jar is inverted over a gas jar containing a coloured gas the gas also spreads into the empty jar.​

Q. What do you observe when a glass of gas jar which appears empty is inverted over a gas jar containing Bromine vapours ? Name the phenomenon.

Q. 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.

Q. Give reasons: ​
A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.​