4HCI+O2→2Cl2+2H2O Cloud of white fumes
JEE Main 2003 — Chemistry Inorganic Chemistry
Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that
Held on 30 Apr 2003 · Verified 6 Jul 2026.
oxygen in air reacts with the emitted HCI gas to form a cloud of chlorine gas
strong affinity of HCI gas for miosture 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.
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