During the preparation of hydrogen chloride gas on a humid day

• GC Acids Bases Salts

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

1. absorb the evolved gas
2. moisten the gas
3. absorb moisture from the gas
4. absorb Cl^– ions from the evolved gas

Answer

Calcium chloride is a good dehydrating agent so it is used to absorb moisture from the hydrogen chloride gas.

The correct option is C.