Q.

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

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a

Due to strong affinity for water, concen-trated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water.

b

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

Concentrated hydrochloric acid emits strongly smelling HCl gas all the time

answer is C.

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Detailed Solution

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

2HCl+12O2Cl2+2H2O

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