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Question

Setting of plaster of paris is       



Your Answer
A

Oxidation with atmospheric oxygen

Your Answer
B

Combination with atmospheric CO2

Your Answer
C

Dehydration 

Correct Answer
D

Hydration to yield another hydrate


Solution

The correct option is D

Hydration to yield another hydrate


Setting of plaster of paris is exothermic process

CaSO4.12H2O  H2O−− CaSO4.2H2O  Hardening−−−−−−−  CaSO4.2H2O

                                      Orthorhombic                 Monoorthorhombic Gypsum

The setting is due to formation of another hydrate                  

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