Question

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 :

Options

• air is heavier than bromine

• both air and bromine have the same density

• bromine is heavier than air

• bromine cannot be heavier than air because it is going upwards against gravity

Answer 1

Bromine is heavier than air

The process occurring here is diffusion and it is unaffected by the mass. Therefore, bromine being heavier, mixes with the colourless air.