The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate is_______________?
Correct answer: B. Alpha - hemihydrates
- A. Beta - hemihydrates
- B. Alpha - hemihydrates
- C. Calcium sulphate dihydrate
- D. Orthorhombic anhydrate
Explanation
Calcining gypsum under steam pressure or in the presence of sodium succinate produces the denser alpha hemihydrate form. Beta hemihydrate is produced by dry heating in an open kettle and is more porous.
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