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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

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concentrated hydrochloric acid emits strongly smelling HCl gas all the time

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 forming water droplets that converts in to fumes

answer is D.

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Detailed Solution

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

2HCl+ $\frac{1}{2}$ O₂→H₂O+Cl₂

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