During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through two guard tube containing calcium chloride. The role of calcium chloride in the guard tube is:
A
it absorbs the evolved gas
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B
it moisten the gas
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C
it absorbs moisture from the gas
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D
it absorbs Cl− ions form the gas evolved
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Solution
The correct option is D it absorbs moisture from the gas Calcium chloride is hygroscopic in nature and its anhydrous salt is deliquescent and it can accumulate enough water in its crystal lattice to form a solution. It is used as a drying agent to absorb moisture from the environment.