Question

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 ______ 

Options

• absorb the evolved gas

• moisten the gas

•  absorb moisture from the gas

• absorb Cl^– ions from the evolved gas

Answer 1

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 absorb moisture from the gas.

Explanation - 

CaCl₂ absorbs moisture to keep the gas in dry state. Otherwise, it will dissolve in moisture to form hydrochloric acid.