Name a gas which fumes in moist air.

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Solution

Hydrogen chloride (HCl) gas is a strong-smelling gas that fumes in moist air.
Hydrogen chloride gas has a very high solubility in water.
Vapors of Hydrogen chloride gas come in contact with the vapors of water present in the moist air and appears in the form of fumes.
This property of Hydrogen chloride gas is often used to distinguish it from Hydrogen sulphide gas (H₂S).

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