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Question

Calcium oxide is used as a drying agent because of its property called .

A
hygroscopy
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B
deliquescence
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C
efflorescence
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Solution

The correct option is A hygroscopy
CaO is hygroscopic in nature, it absorbs water molecules from nearby regions and keeps the region dry. Thus, it is used as a drying agent.
Hygroscopy is the property by which certain salts absorb moisture from the atmosphere to form hydrated salts.

Efflorescence is the property by which a hydrated substance loses water molecules upon standing in air. It is the opposite of hygroscopy.

Deliquescence is the process by which a substance absorbs moisture from the atmosphere until it dissolves in the absorbed water and forms a solution.

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