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

1. it reacts with moisture in air to form HCl fumes
2. it oxidizes to chlorine gas
3. it decomposes to hydrogen and chlorine
4. it absorbs carbon dioxide from air

Correct answer: it reacts with moisture in air to form HCl fumes

Solution

Concentrated hydrochloric acid releases hydrogen chloride gas, which readily reacts with moisture in the air to form hydrochloric acid mist, resulting in the visible white fumes.

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