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 glass plate placed between them. We observe that the red-brown gas will diffuse from jar A into colourless gas in jar B due to which is red-brown colour will also spread into jar B
(i) What name is given to the phenomenon which takes place ?

(ii) Name the brown gas which could be in jar A.

(iii) Which is the colourless gas most likely to be present in jar B ?

(iv) When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment :
(a) air is heavier than bromine
(b) both air and bromine have the same density
(c) bromine is heavier than air
(d) bromine cannot be heavier than air because it is going upwards against gravity
(v) When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect ?
(a) bromine vapour is made of tiny particles which are moving
(b) air is made up of tiny particles which are moving
(c) the particles of bromine are moving but those of air are not moving
(d) even though bromine vapour is heavier than air, it can move up against gravity