Which of the following characteristics applies to plaster of Paris?

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It is a calcined hemihydrate in a wet formIt consists of porous and unevenly shaped crystalsIt is classified as an alpha-hemihydrateIt has a water-to-plaster ratio of 0.2It is completely non-porous

Explanation

Plaster of Paris is known for having porous and irregularly shaped crystals, which contribute to its properties. It is not wet calcined hemihydrate, nor is it specifically an alpha-hemihydrate. The typical water-to-plaster ratio is higher than 0.2, and it is not completely non-porous.