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

NTA AbhyasNTA Abhyas 2020The p-Block Elements - Part2

Solution:

$4HCl+\underset{a i r}{O_{2}} \rightarrow \underset{c l o u d \, o f \, w h i t e \, f u m e s}{2 C l_{2} + 2 H_{2} O}$