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Standard XII
Chemistry
Calcium and Its Compounds
Setting of pl...
Question

Setting of plaster of paris is


A

Oxidation with atmospheric oxygen

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B

Combination with atmospheric CO2

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C

Dehydration

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D

Hydration to yield another hydrate

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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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