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Plaster of Paris must be stored in a moisture-proof container because

Question
Plaster of Paris must be stored in a moisture-proof container because
It may absorb moisture from air and set into a hard, unusable mass
It evaporates over time
It becomes acidic on exposure to air
It changes colour in air
Answer
It may absorb moisture from air and set into a hard, unusable mass
Detailed Explanation
Exposure to moisture in the air causes Plaster of Paris to react with water and set prematurely.
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