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| 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 | |
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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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