Heating of _______________ to 120°C, produces plaster of paris ?
Correct answer: B. Gypsum
- A. Blue vitriol
- B. Gypsum
- C. Calcium silicate
- D. Calcium sulphate
Explanation
Gypsum, CaSO4·2H2O, loses part of its water of crystallisation on heating near 120°C and forms plaster of Paris, CaSO4·½H2O. Calcium sulphate alone is too broad because gypsum is the hydrated starting material.
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