Setting of plaster of paris involves two stages i.e., setting stage & hardening stage. Which of the following are true regarding setting of plaster of paris?

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Hardening stage is a crystalline change in which monoclinic gypsum convert into orthorhombic gypsum

Setting stage is a hydration process in which orthorhombic form of gypsum is formed

Setting stage is a hydration process in which monoclinic form of gypsum is formed

Hardening state is a crystalline change in which orthorhombic gypsum convert into monoclinic gypsum

answer is B, D.

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Detailed Solution

The setting of plaster of Paris is due to its hydration to form crystals of gypsum which set to form a hard solid mass. The plaster of Paris absorbs water to form orthorhombic calcium sulphate dihydrate which sets to form a hard mass containing monoclinic calcium sulphate dihydrate.

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