Explain briefly why calcium oxide cannot be used to dry hydrogen chloride gas?

Question: Explain briefly why calcium oxide cannot be used to dry hydrogen chloride gas?

Calcium oxide (CaO) cannot be used to dry hydrogen chloride gas because it reacts with HCl to form calcium chloride (CaCl₂) and water. This reaction defeats the purpose of drying the gas, as water is produced instead of being removed. For drying HCl gas, a dehydrating agent like concentrated sulfuric acid is preferred since it doesn't react with HCl.

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