Concentrated hydrochloric acid when kept...

Concentrated hydrochloric acid when kept in open air sometimes produces a could of white fumes. The explanation for it is that

Oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine gas

Strong affinity of Hcl 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 itself . This moisture forms droplets of water .

Concentrated hydrochloric acid emits strongly smelling HCl gas all the time

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