What is gypsum

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What is gypsum?

Answer: Plaster of Paris reacts with water to give a hard mass called gypsum.
                   
(CaSO4)2. H2O (s) + 3 H2O (l)   →  2CaSO4.2H2O (s)
                      
Plaster for Paris      + Water     →  Gypsum

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