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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 :A. concentrated hydrochloric acid emits strongly smelling HCl gas all the timeB. oxygen in air reacts with the emitted HCl gas to form a cloud of chlorine gasC. strong affinity of HCl gas for moisture in air result in forming droplets of liquid solution which appears like a cloudy smokeD. due to strong affinity for water , concentrated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water and hence the cloud.

Answer» Correct Answer - B
When `O_2` reacts with the emitted HCl a cloud of `Cl_2` gas produced .
`2HCl +(1)/(2)O_(2) to H_2O+Cl_(2)`


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