Q.

Setting of plaster of paris involves –

A. dehydration process
B. hydration to form other hydrates
C. oxidation process
D. reduction process
Answer» B. hydration to form other hydrates
Explanation: The setting of plaster of Paris takes place by hydration due to the formation of a solid crystalline hydrate and hardening of Plaster of Paris is hydration reaction, which is reverse of the dehydration of gypsum. Plaster of Paris quickly sets to a hard mass when made into a thin paste with water. A slight expansion takes place in the process and heat is evolved. This process is exothermic.
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