A) concentrated hydrochloric acid emits strongly smelling HC1 gas all the time
B) oxygen in air reacts with the emitted HCl gas to form a could of chlorine gas
C) strong affinity of HCl gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke
D) 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.
Correct Answer: B
Solution :
\[2HCl+\frac{1}{2}{{O}_{2}}\xrightarrow[{}]{{}}{{H}_{2}}O+C{{l}_{2}}\]
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