Question : Which of the following compounds is used as a drying agent?
Option 1: Calcium oxide
Option 2: Gypsum
Option 3: Calcium chloride
Option 4: Calcium hydroxide
Correct Answer: Calcium oxide
Solution : The correct answer is Calcium oxide.
Calcium oxide is a drying agent that can dehydrate neutral and basic gases as well as amines, low-boiling alcohols and ethers. It possesses a characteristic known as hygroscopy, which enables it to collect water molecules from the surrounding atmosphere. It is typically used to dry hydrogen and ammonia gas.
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