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:

• A. Calcium chloride
• B. Calcium oxide
• C. Calcium hydroxide
• D. Calcium carbonate

Hint:

Calcium chloride is commonly used to dry gases because it absorbs water and keeps gases dry.

Answer 1

The Correct Option is A

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).