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Question

Chemistry Question on Solutions

Setting of plaster of Paris is

A

dehydration

B

oxidation with atmospheric oxygen

C

combination with atmospheric CO2CO_2

D

hydration to yield another hydrate

Answer

hydration to yield another hydrate

Explanation

Solution

Setting of plaster of Paris is exothermic process CaSO4⋅12H2O−>[H2O]CaSO4⋅2H2OOrthorhombic−>[Heating]CaSO4⋅2H2OGypsumCaSO_4 \cdot \frac{1}{2}H_2O {->[H_2O] }\underset{\text{Orthorhombic}}{{CaSO_4 \cdot 2H_2O}} { ->[{\text{Heating}}] } \underset{\text{Gypsum}}{{CaSO_4 \cdot 2H_2O}}