What is one property of chlorine?
It depends on whether it's physical or chemical.
It is about 2.5 times denser than air.
It can be considered as a bleaching agent.
chlorine is a gaseous bleaching agent. It bleaches in the presence of water due to the formation of oxochlorate(I) acid, HOCl.
HOCl is unstable and decomposes to release oxygen which oxidizes the dye to form a colourless compound.