When the stopper of a bottle full of hydrogen chloride gas is opened, fumes can be seen coming out. Why does this happen?
A
Hydrogen chloride is a noble gas.
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B
There is an immediate reaction between hydrogen chloride gas and water vapour in the air.
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C
It reacts with the bottle to release fumes.
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D
None of these
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Solution
The correct option is B There is an immediate reaction between hydrogen chloride gas and water vapour in the air. Actually HCl is a gas at room temperature. Inside bottle it is present as a liquid. When the stopper of a bottle is opened, HCl gas escapes, comes in contact with water vapours in atmosphere and forms white fumes of hydrochloric acid.