Setting of plaster of paris is 

  1. A

    Oxidation with atmospheric oxygen 

  2. B

    Combination with atmospheric CO2

  3. C

    Dehydration 

  4. D

    Hydration to yield another hydrate 

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    Solution:

    Setting of piaster of paris is exothermic process

    CaSO412H2OH2OCaSO42H2O Orthorhombic  Hardening CaSO42H2O Mono orthorhombic  Gypsum 

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