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Plaster of Paris, on mixing with water, changes back to

Question
Plaster of Paris, on mixing with water, changes back to
Anhydrous CaSO4
Gypsum, forming a hard solid mass
CaCO3
CaO
Answer
Gypsum, forming a hard solid mass
Detailed Explanation
Plaster of Paris reacts with water to reform gypsum, setting into a hard solid mass.
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