oxygen in air reacts with the emitted HCI gas to form a cloud of chlorine gas

strong affinity of HCI gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke

due to strong affinity for water, concentrated hydrochloric acid pulls moisture of air towards it self. This moisture forms droplets of water and hence the cloud.

concentrated hydrochloric acid emits strongly smelling HCI gas all the time.

super-cooled liquid

gel

polymeric mixture

micro-crystalline solid

2, 3, 1

1, 2, 3

4, 1, 2

3, 2, 1

6

7

17

16