Question:

In order to prepare dry hydrogen chloride gas in a humid atmosphere, the gas produced is passed through a guard tube (drying tube) which contains:

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Calcium chloride is commonly used to dry gases because it absorbs water and keeps gases dry.
Updated On: May 19, 2025
  • Calcium chloride
  • Calcium oxide
  • Calcium hydroxide
  • Calcium carbonate
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The Correct Option is A

Solution and Explanation

In a humid atmosphere, hydrogen chloride gas is passed through a drying tube containing calcium chloride. Calcium chloride is a hygroscopic substance, meaning it can absorb moisture and dry the gas. Thus, the correct answer is option (a).
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