Which of the following statements accurately describe the properties and interconversions of Gypsum — s Block Elements Chemistry Question

💡 Solution & Explanation

Gypsum is the dihydrate, and POP is the hemihydrate. POP is prepared at $393\text{ K}$. Upon adding water, POP rehydrates back to interlocking crystals of gypsum, causing a slight expansion that makes it excellent for casting molds. Thus, setting is hydration, not dehydration, making D incorrect.