During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to

(A) absorb the evolved gas

(B) moisten the gas

(C) absorb moisture from the gas

(D) absorb Cl– ions from the evolved gas



Since the day is humid, we need something to absorb the moisture.

Calcium chloride is a hygroscopic salt i.e. it absorbs moisture from the surroundings. 

Therefore, the correct option is (c) - absorb moisture from the gas

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo